Yeah so this ones gonna be two or three parts

"No, I will not!" You asserted, stomping your foot on the ground, even though he couldn't see.

"Please, (Y/N). Mettaton always has huge celebrity birthday parties and I want a birthday with him for once. That way, I'll finally matter to him," Blooky cried over the phone.

You were still tempted to deny him the favor, but he sounded so positively miserable and desperate that you relented, "Okay then, Blooky. But only if you promise to smile."

"Oh, thank you, (Y/N)," he sniffled, "I'm sorry for being a burden."

"It's not you at all, Blooky, it's your pain in the ass cousin. See ya."

You groaned. For some reason, you had agreed to spend an entire night and day with none other than Mettaton EX. Royal star in the world's eye, royal pain in the ass in yours. You just wanted to chill all night, but Blooky was planning a surprise birthday party for him with Shyren and Alphys and needed Mettaton it off the house. Therefore, you had babysitting duty.

Fucking wonderful.

You had about an hour until the robutt showed up at your abode. That meant an hour until your weekend was absolutely ruined. What would you even do with the guy? You had very few opportunities to get to know him, and none of the experiences were very ideal. Most of the time he'd act like a total idiot, dancing and posing and trying to get you to complement him as you tried to watch anime in a corner of rejection.

People weren't exactly your thing. Especially people that wouldn't give you any fucking room to breath and constantly attempted to engage you in conversation.

Might as well catch up on something while you waited, cause you knew you wouldn't get the chance after he arrived. You opted for sitting on the couch and watching a couple episodes of Soul Eater (Or whatever anime you like idk you).

All too soon, the doorbell rang and you opened the door to see Mettaton in all his gorgeous glittery glory (he may be a pain, but he is an attractive one).

"Ah, darling! I'm so glad you want to get better acquainted. By the end of this sleepover, I'm sure we'll be best friends," he said excitedly.

"Mhmm, I'm certain," you replied sarcastically, closing the door behind him.

"So, what first darling? Movies? Scary stories? Oh, we could do each other's hair!"he squealed.

"Whatever you wanna do, Mettaton. You're the star."

"Darling, don't be like that. I want you to be happy. Otherwise I'll have a horrible time too. I'll do anything you like."

"Anything?" (A/N: Resist the lemon temptation... Reeeesssiiiissst)

"Yes, of course. It won't be any fun if you're acting like this the whole time."

You smiled gleefully, "Well, one thing I've always wanted to do at a sleepover is watch the entire Harry Potter series nonstop. I don't know if you're up for that, though."

"I'd prefer my movies, but that'll do."

"Yay!"you cheered quite childishly. Maybe the night wouldn't be complete shit after all.

TEM SKIP

You sat on your bed watching The Order of the Phoenix, and were about halfway through. Mettaton was lying on his side next to you, occasionally reaching into the popcorn bowl resting in your lap.

"Darling, I'm bored," he complained.

"Shh, lemme watch!"

"Can I braid your hair? It'll be fu~un," he chimed. (Sorry if you've got really short hair, if you have short hair and a fringe, imagine he's doing a braid thing with that. If not, he's just brushing through it.)

"Okay, sure. Just don't hurt me."

"I'd never dream of it, darling. Now, come on." He day behind you with crossed legs, and patted his lap to signal you to sit.

You rolled your eyes but did so anyway, the relaxing scootching back and depositing your butt in his lap, quite ungracefully. He hummed his theme song quietly as his fingers stroked gently through your hair, styling it to his liking. It was actually kind of relaxing and you accidentally let yourself lean back into him.
 
SPOILERS

Even after he had finished, you didn't move. You weren't sure if it was because you actually liked sitting in his lap or because you were too lazy to move your ass. Most likely a mix of the two. You stayed sitting there with your head tucked into the crook of his neck and his arms around your waist.
You watched the movie peacefully, until the end.

As Sirius disappeared in wisps, you began crying. It was emotional and you couldn't help yourself. You were attached to him, okay. Mettaton took notice of this and chuckled, wiping the tears from your face and questioning you.

"Just that bitch- And Sirius didn't deserve that to die at all" tears still poured from your eyes, but Mettaton openly laughed.

"You're quite adorable, you know.  But, I think it's time to shut it down. After all, I understand that humans like yourself need to sleep."

"Fine, I guess," you managed to brokenly laugh.

You shut off your T.V. then the light after Mettaton had plugged in his charger, sitting in a chair in the corner. The only light in the whole room was the soft glow of Mettaton's heart. The dark silence made you think.

"Hey, Mettaton, why were you so eager to come over?" You randomly asked.

He was silent, thinking.

"Because, well," he began. You took a breath and worried over what he had to say.