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It starts late at night when Barty and Evan are high and get into a fight, as they always do. Regulus is on his bed reading as he tries to ignore their bickering. And it's only when Evan decides to completely ignore Barty that Barty makes the unexpected move to leave Evan's side. It's likely because he's annoyed and high and Barty doesn’t think things through when he gets like that.
His steps were uncoordinated, and the rest of him was a fumbling mess as he crawled onto Regulus’ bed. Evan only stared at him silently as he struggled.
Regulus had only stopped reading when Barty had pushed the book aside to make room for himself as he straddled his lap. Only gave Regulus a lazy smile before his hand took hold of his face and pulled him up for a kiss. It starts slow, a press of lips barely there before Barty adds pressure.
Regulus remains frozen. Eyes wide and completely still.
It was soft, one might even call it innocent.
But nothing with Barty could ever be called innocent.
Barty pulls back from Regulus and giggles before he goes for it again. One kiss, then another, and another, until Regulus begins to respond. Nothing big, just a little pressure in return.
That was Barty's signal to continue.
That innocent kiss turned hungry. Barty is pulling Regulus closer, biting and tugging on his lip for more of a reaction. Sucking and whining because that's the only way Barty knows to get what he wants without actually asking.
But it doesn't work the way Barty's used to it working. Regulus doesn't do the things Barty expects because Regulus isn't Evan.
It both annoys and excites Barty, because Regulus is new. Regulus is a new person who likes things differently. Regulus is a game Barty doesn’t know the rules to, but fully intends to win regardless.
That excitement is what drives him to start grinding on Regulus. A slow circular motion that gets him to breathe hard into every kiss they share.
Regulus doesn't fight it. He goes along with it because even though he's sixteen Regulus has never been kissed before and he really likes the feeling of Barty on top of him giving him all this attention.
Evan just watches from his bed confused and amused as Regulus’ hands are hovering over Barty's body, unsure of what to do with his hands. He sees how Barty slowly grows desperate with how little of a response he's getting. Part of Evan wants Barty to feel unsatisfied with his little stunt, but at the same time he doesn't want Regulus to miss out because he's clearly enjoying the attention.
So now he sits on the edge of Regulus' bed and watches closely as Barty opens Regulus mouth and licks his tongue. He should feel disgusted at the display, but finds it compeling instead. Evan couldn’t help but run his hand down Barty's back, causing him to arch beautifully.
Barty broke away from the kiss, panting against Regulus swollen lips but eyes entirely focused on Evan.
"You have to go slow with him Bee. He hasn't done it before."
Barty groans before he pulls back from Regulus only for him to chase after Barty's mouth. Evan was quick to pull Regulus' face away from Barty so that he too could get a chance to taste him.
He tastes of strawberries, red and sweet.
"He's good don't you think Ev? Some time with us and he'd be perfect."
Yeah, perfect.
Evan breaks from the kiss with a final bite on Regulus' lips. He's panting and looks a mess with flushed cheeks, messy hair, and swollen lips. He was sure they could make him look worse.
"You can tell us to stop Reg.”
“But Ev, we could have so much fun together.”
“Regulus, if you tell us to stop, we will."
Barty leaned down and kissed on Regulus' neck. There was a small gasp that escaped his lips, a small little sound that could just barely be classified as a moan. Regulus was trying to be quiet, trying to make it seem as if he wasn't enjoying having all the attention.
"Tell us to stop Regulus."
"Don't stop it Reggie, you know you want us. Always too scared to ask, but I know you. I know you like to jerk yourself off when you hear us. Just imagine if we were to do it with you. Wouldn't you like that?" Barty breathed the words against his ear as Evan took his turn ravishing his neck. There were already small marks forming on his skin.
"It can be this one time, and we never have to say anything again. Just this once Reg. I promise we'll make it good for you?"
"Just once?"
"And anytime you ask after, but only if you ask."
"Okay."
"Okay?
Regulus nodded and Barty didn't wait a second before he kissed Regulus again, pushing him further onto the bed. His movements much firmer, much stronger, as if it were Evan he was kissing.
Evan pulled him back by his hair, "Easy Bee, you don't wanna scare the poor thing."
And so it went, Barty pushing and pushing until Evan rained him back into control.
Biting, sucking, calling out for Barty, for Evan. A mixture of sounds that no one paid attention to because Evan and Barty are always fucking. This time, though, the barely there sound of Regulus' soft ‘ah, ah, ah’s joined them in their pleasure. All attention focused on their inexperienced lover as they taught him how to want, how to give, how to take without apology. Slowly growing louder and louder until he no longer hid his desire.
Walking to the dining hall Evan and Barty looked the same as always, hair a mess and bruises decorating their neck. There was no question of what they had been doing, but when Regulus was trailing behind them looking just as wrung out people began to whisper.
It wasn't until Barty sat down and pulled Regulus on his lap and Evan took his hand and kissed it that people realized that Barty and Evan had added someone else to their once believed unbreakable duo.
Lips red and swollen, bites and bruises all over his neck, people couldn't help but be jealous of Regulus Black.