(AN: image of Slaanesh is from IdiotOfTheEast).

"And you uhhh... clench your cheeks and yell smash!" Said All Might with a smile while in his skinny form.

An 17 year old Izuku looked at him with a blank look, that was way to little information to help him with learning how to eventually use OFA, given he's currently ahead of schedule by a whole month and will get to spend said month training before UA entrance exam.

"Um... do you have any other advice... or how do I fight?" Said Izuku hoping for something.

"Well like I said.. j-just squeeze your butt and yell smash, then just punch the enemy and you win. That's what I do" he said in a embarrassed tone.

Izuku heard this and decided at this moment to go and try to learn how to fight on his own. He was gonna be a hero and he needed every advantage he could get.

___

Walking around in the library, he looked over the shelves trying to find books on self defense, he was having a hard time given now days people relied on quirks or quirk only gyms.

He could still faintly remember the last time he tried to apply for a gym to exercise and train, but they kicked him out all because he was quirkless. After that; that gym and all the ones in his area put up signs saying 'quirkless aren't allowed'.

Sighing sadly, he continued to walk down the isle, when his eyes spotted a book saying something about self defense. Reaching up for it, he stood on his toes and his fingers just barely grasped it.

It took him a couple tries, but eventually he was able to wiggle it enough and grab the book, pulling it down so he could read it.

Opening the book he began to read it, but his face went red and he slammed the book shut and reread the cover.

'How to defend yourself from a lustfull lover' By Nemuri Kayama.

Getting even more red, he shoved the book into the shelf hard and he wanted to die from sheer embarrassment because of that book.

"Why can't anything in my life just be si-ow!" He was cut off when a book landed and hit his head hard.

Rubbing the top of his head to ease the pain, he looked down at the book and was confused, it was black and slightly burned. Not only that but it said some about summoning, shrugging his shoulders he decided to take it, hopefully it wouldn't be another perverted book like the last one he just saw.

Walking up to the librarian, he tried to rent the book, but she said, it wasn't registered with then and it was badly damaged, so he can have it for free.

Thanking her, he went home and absent mindedly wondered why he decided to take this book, it was beyond damaged and yet he took it with him.

___

Arriving home he went straight to his room and began to read the hook which spooked him on some parts but also intrigued him greatly about summoning.

He continued to read and it said that in order to summon a creature or even a demon, one would have to be very powerful with their soul also paying a slight amount for what the summoner would summon.

"Ok so first I need to draw a summoning circle then draw a contract seal on my hand then.... offer a single drop of my blood.. to summon my summon.. or also called familiar" said Izuku.

In any normal circumstances, Izuku would never do this, but given how socially stunted he was and that his teacher wasn't exactly helping, he didn't see anything wrong with him doing this.

___

It took Izuku well over 3 hours to draw the circle and contract seal, but now that it was was done, Izuku stood up and held his hand out before pricking his finger to get a single drop of blood which hit the circle.

Nothing happened for a second which made Izuku sigh and realize he wasted his time, but then... the seal glowed and a massive cloud of smoke exploded from the seal covering his room.

Coughing loudly and waving his hand to clear the smoke, he instantly went red from what he saw.

He was looking a beautiful woman with long wavey silver hair, with a black crown that had a pink gem In the center on her forehead. She had long pointed elven like ears. Her skin looked smooth as silk and didn't have a single blemish or any hair on her body beyond her neck and her chest was massive, easily over DD cup (which made Izuku even redder). She then slowly opened her eyes showing bright pink eyes and she looked over at Izuku with a slight sly smile.

"Were you the one who summoned me?" She asked with a silky smooth voice as she smiled at him and jutted out her wide hips, which finally made Izuku realize something.

She was butt naked.

"PLEASE PUT SOME CLOTHES ON!!".

The woman looked down and chuckled before she walked towards Izuku and smiled seductively "why would I do that when I get to see that reaction?".

Izuku eeped when she caressed his leg.

"You summoned me and not only that but... I can already feel the contract seal" she said gesturing to her chest where it was placed right above her large breast. "Not only that but your very very powerful... hehehe I will reward you how ever you see fit".

Izuku went redder as she strattled him and had her large heavy breasts over his head.

"My name is Slaanesh.. and your my master" she said with a blush as she enjoyed the nervous look on his face.

"M-m-master!?" He said still just as red given the beautiful woman was still butt naked and he got a full view of everything.

"Mhm, you freed me from that book for God knows how many years and since you fulfilled the summoning, we need to finalize the contract~" she purred out as she leaned close enough that her warm breath was washing over him.

She then pressed her lips against his and ran her hands through his hair, making his eyes go even wider in shock.

"Mmm~" her hand drifted down his body until it reached the part she wanted and even she gasped when she felt it "my my~ you really are big~ you just might tear me in half~" she said seductively.

Izukus head was spinning from first seeing a naked girl, then getting kissed and finally her rubbing her hand over his dick.

Given she kissed him, the contract finalized and now they were officially master and summon.

It took all of Izukus will to push her off of him and throw a shirt at her for her to put on, which she of course pouted at since she wanted to go all the way.

But she sighed and put a shirt on that was to big for her, but her chest and hips still stuck out even with the large shirt on her.

"S-s-so Slaanesh... t-tell me a-a-about yourself" he stuttered out.

Giggling a bit, she smiled "well from the book you read, I'm sure you saw that I'm a demon that was sealed a long time ago. But besides that I love sweets and to read romance novels with sex scenes (izuku went red at hearing that), I enjoy fighting and perfecting my fighting style and lastly~ I love having sex and since your my master I will have to have sex with you".

Izukus brain couldn't handle it and he passed out from blood loss via nosebleed.

"Oh he's passed out......... nah I won't suck him off this time, maybe when we are a bit closer and he doesn't die from embarrassment" she said with a giggle.

___

"Ugh..... my head..." said Izuku holding his forehead in pain while his head also felt like it was laying on the softest pillow in history.

"Ah good your awake Izuku, though I was enjoying having your head on my thighs" she said with a smile as she blushed and her long ears began to wiggle.

Izuku immediately shot up "s-sorry for touching you..." be said embarrassed.

"Oh please, you can touch me wherever and whenever you want, I won't complain~" she said with a perverted grin.

Izuku looked away blushing more "I-I can't do t-t-that... we barely k-know each other and w-w-we aren't even dating" he said embarrassed.

Slaanesh blew a raspberry "we are summon or familiar and master, we are far beyond that, besides I've had to please myself for over like 1000 years... I will be patient with you Izuku.. but I do want more than that kiss I give you... I want you to break my body" she said with zero shame and a massive perverted grin on her face.

Izuku blushed even more and couldn't even look at her "o-oh S-slaanesh... what can you do?".

Raising a eyebrow she shrugged her shoulders "I have immense strength, probably be considered super human given I can lift over 1 ton, I have almost bottomless stamina, I can charm people and release a pheromone that makes them more into the mood, I can use the energy you give me and shoot off what you'd consider magic blasts and I can transform into two other forms. My combat form and my rage form, but I prefer to stay in this one" she said.

"Wow... that's all amazing" he said as his quirk nerd side took over and he didn't register the fact she said, she can release a pheromones to make people horny.

"Mhm, now it's your turn, what can you do?" She asked him.

"Oh um... I like to read and write in my journals... I like to study quirks and....... that's all really" he said getting depressed at the end.

She looked at him for a moment and didn't like that he was getting depressed, so she did the only thing she could think of.

Izuku was about to say something else, when Slaanesh moved in and kissed him again, completely catching him off guard. She then hummed into the kiss as she straddled his legs and began to run her fingers over his chest and stomach, feeling his muscles. She smiled in the kiss when she felt him getting excited but stopped for second when she felt scars over his chest, through the shirt.

After a couple more seconds she pulled back from the kiss and grinned "Well your not depressed now" she said smiling as she looked at his cherry red face and not mentioning the scars yet.

"It's only been a day and I've been kissed by a beautiful woman twice!" He thought to himself.

"Aww you think I'm beautiful" she said with a seductive grin.

Izuku realized he muttered that and wanted to die of embarrassment.

"So who are all these people in these posters?" She finally asked looking around the room and seeing posters of lots of different heroes, but mainly some person called All Might from what some said.

"O-o-oh um... they are all h-heroes I look up t-to a lot... especially All Might" he said with a sad smile.

Slaanesh frowned at seeing him sad, so she leaned down and kissed him again making him jump in surprise.

Baking a bit away he looked at her with a red face "w-w-why do you k-keep k-k-kissing me!?" He asked.

"Because it helps me recharge so I can stay here, plus I'm extremely touch starved and I'm tired of using my fingers on my lips" she said pointing down.

Izuku passed out again via nosebleed.

"Hmmm maybe I can tone down my sexual talk" she said before placing his head in her lap again "hmhmhm this is nice".

Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

It was the next day and Izuku was walking to the hospital his mom was working at. She sadly couldn't go home last night and ended up sleeping at work, which broke her heart that she was that tired that she couldn't see her baby boy.

But this morning was thankfully Izukus day off from school and also his rest day from exercise.

"Hmmhmmhmm I can't wait to meet your mom, master" Slaanesh said as she followed him while wearing some new clothes she got since Izuku used his money and bought some for her.

It was a black low cut tight shirt that exposed her stomach and she wore shorts that went half way down her thigh, which showed her thighs that were also covered by her thigh high socks and her shin length boots.

Her outfit of course got lots of stares, that she didn't even care to notice, she chose it to get Izukus eyes on her and it did wonders.

Plus it also helped that she woke up this morning with him hugging her from behind in her sleep.

"I hope you like her, she's really nice and I think she'd like you" said Izuku pulling her out of thoughts and before they became perverted.

"I'm sure I will.. so what are those?" She asked pointing at the food Izuku bought for his moms breakfast/lunch.

"Let's see.. I made onigiri, fried fish, sliced cucumber, some egg drop soup and some fried pork along with seaweed salad" said Izuku hoping this would be enough for his mom since she hasn't eaten anything since lunch yesterday.

"Aww that's so sweet of you" she said as she hugged him from behind squishing her very large breast into his back.

This of course made him go neon red from embarrassment and around him, the men glared in jealousy along with a couple woman as well.

"S-slaanesh" Izuku squeaked out.

"Hmhm what's wrong?~" she said pressing them more into his back.

Izuku wasn't sure how long he'll live with her being like this or how little shame she had with doing stuff like this.

"No I'm the future number one hero... I have to push through and become stronger!!" He thought as he tried to steel his resolve.

That lasted all or 2 seconds, when Slaanesh licked his ear and enjoyed how embarrassed he was, it made her own ears start to wiggle in happiness.

She continued to tease him along the way to the hospital, before they finally arrived and she promised to be on her best behavior to impress Inko. She wanted to get brownie points with her masters mom.

Walking up to the front desk, Izuku asked for where his mom was and the nurse told him, she was on the third floor and should be about to go on break.

Thanking her, him and Slaanesh left and rode the elevator to the third floor, where they began to walk to where Izuku saw his mom in the distance, walking into a patients room with a cart.

As they walked, they passed a door which opened and a woman walked out and stumbled into Izuku.

Tripping a bit, Izuku landed on his back and he moved his hands to catch the person who landed on him. Opening his eyes, he was met with beautiful gray eyes and long snow white hair, from a woman who looked to maybe be in her late 20's to early 30's.

Rei opened her own eyes and was met with bright green orbs and a cute face with a line of freckles across his cheeks. Her face went red when she noticed that she was ontop of him and he had his hands on her hips to hold her up.

Both of them blushed even harder when she realized, not only was she ontop of him, but she was sitting right on his crotch. Quickly trying to stand up, she ended up tripping over Izukus legs and landed on her butt.

Meanwhile watching all of this was Slaanesh who was enjoying the show "Ara ara~" she said with a blush as ideas popped into her head.

Izuku managed to stand up first and offered his hand to her "I'm so sorry, I didn't mean to do that or touch youpleaseforgiveme!!" He said before his speech started to blur into a single word.

Still blushing she gently took his hand and froze for a moment noting something "its warm... but not.. that can't of warm...." she thought as he helped her up. "It's alright.. it was also my fault for not paying attention either..".

"Once again sorry... um.. I'm Izuku Midoriya and this is Slaanesh" he while gesturing to her, who smiled with a slightly seductive grin as she noticed that the woman's eyes did glance at Izuku given what just happened... and she felt how strong yet warm and soft his body was.

"Yup I'm Slaanesh, nice to meet ya" she said with a smile.

"Oh um... my name is Rei..... just Rei" she said with a slight depressed tone.

"It's nice to meet you... Rei.. um I mean you no disrespect but I have to go see my mom, she's about to go on lunch break and she hasn't eaten anything since yesterday. So it was nice meeting you and I hope we meet again" he said with a bow before leaving and heading towards his mom.

Slaanesh stayed behind since she wanted to talk to Rei for a second.

"He thinks your very beautiful, which I have to agree with" she said since when they first met, she saw Izukus mouth whisper beautiful.

"Oh.. um thanks" Rei said unsure how to reply to a genuine compliment... but it did make her chest feel warm.

"Ya know... if your looking for someone, I don't mind sharing and he's a really good guy" she said with a grin as she watched Rei blush. "Anyways I gotta go bye bye~"

Watching her walk away, Rei sighed and walked back to her room and sat down on her bed and looked out the window as her mind began to wander.

That was the first time a man touched her in any way in almost 12 years now... and in a way, it felt nice... it felt like she was safe and would never get hurt again.

"What am I thinking... I'm 42 years old even though i don't look a day over 26..." she said as her mind went to a darker place.

Married at 16 and had her first kid before she was even 17 and a half... then not even 2 years later she had her second kid... then again a couple months after giving birth, she got pregnant again by her....... husband. When she was 24, she had her final kid Shoto... and Endeavor only stopped having her pop out kids since he had the half fire and ice quirk.

Rei started to hyperventilate as her life began to flash through her mind... but then it stopped when it flashed to Izuku with a embarrassed blush on his face. That was enough for her to calm herself down and not go into a panic attack.

"W-why did he help me..." she said wondering why a picture of him stopped her from panicking.

As she thought of that, she was completely unaware that Slaanesh used a bit of her charm to effect how Rei saw Izuku. Not enough to control her, just enough for her to notice more.