It has to be said, Leo looks really fucking cute slung over Raph’s knee like this, tinted red at both ends as his hands fist in the blanket. He’s trying so hard to keep it together, really, his leader face narrowed in concentration, but it won’t last and they both know it. 
Case in point: Raph concentrates and hits Leo just right, just catching the edge of his cute little tail. He’s seen his brother take much more vicious blows without flinching, but here, Leo stiffens ever so slightly, a tiny whimper escaping him. 
“How many is that?” Raph asks, gently smoothing his hand over Leo’s bottom. His brother stiffens at the touch, pressing his cheek against the blanket, but doesn’t answer. 
“Stubborn, huh?” Raph hits him again, right over a particularly vivid handprint. “Baby’s in a bad mood.” He pauses, squeezes hard enough for his nails to leave an imprint. “Daddy needs to give you a licking.” 
Leo rolls his eyes, like Raph can’t feel how fucking turned on he is right now. He gives Leo a particularly heavy blow, nice and easy on the juncture between ass and thighs, jerking his knee up at the perfect moment to press against Leo’s crotch. 
His brother lets out a tortured squeal, tail fluttering, and Raph can’t resist the urge to hit him hard across the tip. Leo jolts, hard enough that Raph has to seize him by the ass and the back of the neck so he doesn’t fall to the bedroom floor. 
“Steady, baby,” he chides, patting Leo on the rear. “Let Daddy do his work.” And work he does, with a barrage of vicious little spanks, none of them hitting the exact same spot. 
Leo doesn’t jiggle easily, but Raph can see it now, see the shudders and twitches passing through his whole body. His brother’s face is red now and he shoves it into the blanket, squeezing his eyes shut like a little kid who thinks you can’t see them if they can’t see you. 
“None of that, now.” Raph gives Leo a particularly brutal blow, forcing him upright with a startled squeak. “How can I tell you’re learnin’ your lesson if I can’t see your face?” He reaches down to tap Leo’s cock teasingly. “You could be enjoying this, for all I know.” 
Leo swallows hard. “Go fuck–” 
Raph yanks his tail away and delivers a nice hard spank right over Leo’s cute little hole; Leo yowls, scrabbling at the bed like a trapped kitten. Raph seizes him by the chin and jerks his head up, forcing their eyes to meet. 
“Now, that wasn’t very nice,” Raph growls. “You gonna say sorry, or will Daddy have to get his belt?” He knows Leo hates being belted, and to be honest Raph kind of feels the same; there’s nothing quite like the intimacy of a hands-on spanking to get them both riled up. 
Leo’s throat works, the last of his pride trying to hold him back, but he knows who he belongs to, at least right now. “I’m sorry…” A pause, Raph waits patiently; patience is usually so hard for him, but not right now. “...Daddy.” 
“Good boy,” Raph coos, stroking his hand down Leo’s shell. “So good for me, sweetheart.” Leo squirms, and shit, if Raph doesn’t finish this up one of them is going to cum soon. “Just a few more, okay, honey? Then once Daddy gets you nice and warm, we can really play.” 
Leo grits his teeth, shaking his head a little like he’s actually trying to collect himself. Raph hits him extra hard for that and is rewarded by the sight of his brother slumping back down in a perfect, boneless puddle.