Nico's POV
It was Williams 21st birthday, and I knew what I was going to get him. We have been dating for five years now, and we still haven't well had um quality alone time (cough* cough*) not that we didn't want to it's just we were never alone long enough, and I didn't feel comfortable. I knew William wanted to he never said it directly, but when ever I took of my shirt or I won capture the flag and did a victory lap (Percy's idea not mine) he would alway moan and go and take a really long shower.
As much as I wanted to say how I was counting down the seconds till his birthday, but I was actually really nervous. This would be my first time, I had literally no idea what to expect; and of course William was how do we say had experience (we broke up for like two months, he didn't stop apologizing when we got back together.) this means William already knew what he liked, which kinda brought up some pressure
"Hey babe!" William snuck up behind me, I smiled at my glowing boyfriend.
" Hey Will looking forward to your birthday." I bit my lip looking down .
"Yah , I'll finally be able to drink." He smirked, his body was leaning forward and I could feel him.
"You coming to the bar with me Di Angelo?" I felt myself shaking, did William realize what he was doing to me, or was he hard like this all the time?
"I'm to young, and I don't even have fake ID." I muttered.
"Then who is going to make sure I don't do anything stupid, or at least be there if I want some company." He raised his eyebrows, did he know what I wanted to get him?
"Well I'll see what I can do, okay" William gave me a puppy dog face then nuzzled his face in my neck.
"Okay, because all I want from my birthday is you." He kissed my cheek and I blushed like a tomato.
"Trust me, you will have me."I smirked, William looked at me with those dazzling blue eyes confused on my tone.
"So what are you going to get me?" He bit his lip, hopping he was hearing me correctly.
"Why ruin the surprise." I gave him a wicked smile, I could feel his heart racing. I secretly loved how I had him in the palm of my hand, how he hung off my every word; he must have wanted me for quite some time to go like this for the mere mention of a night together. I took a step forward leaving my lovers warm arms, kissed him then ran off to sword practice.
Time skip to William's Bday
I took an extremely long shower making sure every inch of me was ready for the son of Apollo, I even did my hair (meaning I brushed it) and wore the nicest thing I owned. I grabbed a little black box containing my G rated gift for William, a silver heart charm with the inscription (N❤️W) it costed a pretty penny, but he was worth it. Grabbing my wallet I ran out to meet my boyfriend, the Strolls hooked me up with a fake ID for the price of five happy meals toys include.
"Hey Birthday Boy." I kissed his cheek, William smiled putting his hands around my waist.
"Hi Death Boy, ready to get drunk." He laughed, it was like music that made me wanna kiss him.
"Are you to done, the bar will be closed by the time you two stop making goggly eyes at each other." I rolled my eyes at one of William's friends. The whole trip to the bar they belted out Call Me Maybe, which I did sing along to. After twenty minutes of driving we had made it to the closest bar, we all jumped out of the car and walked to the entrance where no one realized I was a minor. There were some balloons William thought it was hilarious, he ordered a beer and I got a shot of tequila.
"Who knows what will happen to me after this drink, I might do something crazy." William ran his hand through his golden locks and smiled, I smiled back.
"From previous experience with alcohol, one sip of this and I'm not sure if I can keep it in my pants." William froze and gulped, I owned his ass right now.
"What previous experience?" He mumbled.
"Wouldn't you like to know, and who knows you might be my victim tonight." I winked, William started at his beer and then my shot like he had no idea what he was into.
"Wanna see what I got you." I rubbed his arm slowly, and gave him my best sexy look.
"Yes." He said it like he was about to jump on top of me, I pulled out the box and handed it to him. He looked mildly disappointed when he saw it, he was probably hopping for something dirty. He slowly opened the box and saw the charm and tears welled in his eyes.
"Nico I love it, it's the most beautiful thing I have ever seen." He kissed me with his strong warm lips, kissing William is one of my favourite activities. After a few more hours of drinking and kissing we all left for home (with a DD we aren't idiots) we snuck in the entrance hopping no one would see us, I was feeling a little woozy from tequila but I still knew what I wanted William.
Okay if you don't like smut I suggest you don't read this!
I took his hand I pulled him close.
"How about you stay in my cabin tonight, I promise it will be fun." I ran my hand through his hair, and gazed into his beautiful eyes.
"Okay probably a good idea, knowing my luck someone will rat me out from my cabin." I kissed him, but this time was more rough, I bit his bottom lip as we separated. Running to my cabin with William trying to catch up I unlocked the door and pushed him in.
"Okay close your eyes." I said slamming the door.
"Why?" I glided over to him pushing him on the bed.
"Because baby, I wanna give you your birthday present." I could see the lust in his eyes.
"Okay, but I thought the charm was my gift?" He looked down at the ground, rubbing the back of his neck; I leaned in and whispered in his ear
"Trust me sweetheart , that was only the beginning." I got up and walked to the other room, where a more risky outfit awaited me.
"Don't forget to close your eyes, I don't want you to ruin the surprise!" I called peeking out to see William shut his eyes tight. I quickly changed into one of William's oversized t-shirts and threw off my boxers, fixing my hair so I looked presentable to my lover.
"Okay keep those eyes closed." I tip toed and sat on William's lap.
"Now put your hands out." He did as he was told, I wrapped his arms around me.
"Okay, open your eyes." William's eyes fluttered open. For a moment he just stared at me, his dazzling eyes taking in the situation.
"Wow." He whispered, as a blush grew on his face.
"Are you sure?" His voice trembling, I felt he was enjoying the view because I could feel it brush against my leg.
"More sure of anything in my whole life." William's hands ran up my spine, filling me with lust. With a swift tug my shirt was on the floor, and William was taking his off. Throwing my on my back on the cold sheets of my bed, as I could hear him fiddle with his belt. Sprawling out to make sure William could see everything, he mound at the sight as he sat on top of me completely undress. Blushing like a moron, as he licked his lips. He lined it up, with his arms resting on the bed frame for extra support.
"You ready baby?" He giggled, I traced my hand down his six pack gazing at him lovingly.
"Always have been." In less than a second, a new kinda pain filled me; one that stung but filled me with a new sensation. Lust consumed me, I arced my back as I screamed William's name. Wills moans were loud and addicting to  listen to, as his grip tightened on the bed frame.
"Oh, yes, right there, Oh baby this feels so good!" My body was trembling but thirsty for more, William pulled out of me and wiped the sweat off his forehead. He bent down and kissed my nose traveling down when our lips met it felt so different, more meaning was behind it William's eyes met with mine and blood filled my cheeks. With a smirk on his face he kept going down, biting and licking with hickies  following each encounter with his mouth and my body. Warmth from lips made me feel like I was about to pass out, as his tongue swirled around; until the bitting  began once more.
  "Will, I'm going to-" I was interrupted but my cum squirting into Will's mouth, who swallowed every drop. When I was done William came back up, dripping with sweat, his hair all wet yet fluffy all at the same time.
"So how did you like your birthday present?" I smiled.
"It was amazing." William putting his head on my shoulder.
"Hey Nico?" He looked up at me.
"Yes lover." I playfully said.
"I love you." His voice was so innocent despite his actions a few moments before.
"I love you to Birthday Boy." Then we drifted asleep in each other's arms.

Hello this is MarkoftheFanGirl, sorry if that wasn't very good this is my first smut story. I hope you guys liked it, and remember I take requests and I love to hear what you guys think.