Despite all the bluster, it's easy to figure out how young their other selves are, how scared, stumbling into things with little more than porn sites and contradictory TikToks to guide them. Leon is clearly the naturally dominant one here, but he's reckless, arrogant, while Raphie is a sub trying to get around his size and his former responsibilities as leader.  
They set up in the bedroom, clearing a shape big enough for Raphie to lie on his spiky shell. He's tense and flushed, squirming slightly as Raph kneels between his spread legs and sets to work.  
"Relax, kid," Raph says, not unkindly, squirting more lube on his hand. "You're doing great." He slips a second finger inside and Raphie gasps, teeth glinting. Leon looks over from where he and Leo are kneeling over the toy chest, biting his lip. 
"You like them, don't you?" Leo asks. "Those teeth of his, I mean." 
Leon flushes. "I--" 
"Easy." Leo places a warm hand on his shoulder, gently rubbing along his shell. Leon leans into the touch almost automatically, tension draining away. "There's no shame in liking what you do, as long as you're careful." 
He turns back to the chest. "The trick is finding him a gag that lets you see those pretty teeth, but that doesn't put either of you at risk." He picks up a clear plastic ring, turning it over in his hand. "Something like this, but bigger. We can ask Donnie for help if we need to." 
Leon bites his lip. "I--I haven't talked to Donnie about a lot of this stuff..." 
"Relax," Leo says. "If your Donnie's remotely like ours, he's got kinks that would put ours to shame. He'll understand." He sets the ring aside, licking his lips. "And until then, I can give you a few demonstrations on how a good sub sucks cock." Leon lets out a little squeak of that, and Leo gives him a devilish grin. 
A low moan draws their attention and they both look over to see Raphie shuddering on the ground. "Raph, how're you doing?" Leo calls. 
"Working on it," Raph mutters. "He's not gonna be able to take a full fist today, y'know." He bares his teeth and gives Raphie a fine slap on the rear. "Even with a big, beautiful ass like this." 
"Not today, anyone," Leo replies cheerily, turning back to the box. "We'll start with the black ropes--more neutral. I'll help you find some blue ones soon. And we can tie the right kinds of knots so that even someone as strong as your brother won't be able to break free." He shrugs. "Good be useful outside the bedroom too, actually." 
"Yeah...." Leon sounds slightly dazed. 
Leo frowns, putting the ropes down. "You okay? I don't want to push you guys too hard." 
"N-no." Leo straightens up to meet Leo's gaze, eyes bright. "Dude, I just feel so alive. Like, I love life and I love him, and it should be wrong, but I didn't know I could feel this way before." 
Leo smiles, more gently this time. "I know the feeling." He takes Leon's hand. "But you have to be careful with him, you understand? Take care of him above all else?" 
"Always," Leon says, more serious than Leo's ever seen him. 
"That's good." He pats Leon on the shoulder--not the head, he needs to feel more grown-up and in control for what's to come--before turning back to the box. "Now, about inflatable plugs, Raph particularly enjoys me in this one..." 
"If you two ain't too busy yammering, we've a turkey here who's about ready for stuffing'," Raph calls. Raphie lets out another moan, wiggling his hips easily, and Leo sucks in a sharp breath. 
"Well," Leo says, taking his counterpart's hand. "I guess we'll have to give you a determination, won't we?" He snatches up the plug and gently guides Leo back towards where their brothers wait, ready for the night to truly begin.