The one flaw about fucking Leo's throat is that Raph can't enjoy the full spectrum of his big brother's incredible range of noise. Leo's either babbling annoying shit or ninja-quiet out of bed, so it's taken work to find a happy medium; things got a lot easier when Raph discovered his baby was a vocal delight in bed.  
He could while away the days savoring all of Leo's squeaks and shrieks, his churrs and purrs, his groans and moans, his frantic cries and pleas for mercy. To be honest, just not the same when Leo's sucking dick at the same time, when all the sound is muffled in a way that's both delighting and irritating. 
Doesn't help that he has a habit of concentrating too much, treating a blowjob like a kata. It makes for pretty good blowjobs, but Raph has gotten used to have  
Still, Leo's never one to let a little thing like a fat cock on the tongue stop him. Take right now, when he's lying with his head between Raph's legs, hard at work with his head bobbing up and down. 
There's not a lot of room for noise, but Leo's still able to pull off a soft little whimper as Raph slides in and out, combined with the occasional sharp gasp. The sound is amplified by the almost frantic puffs of air coming out of his flaring nostrils, the way his breath hitches ever so slightly.  
It's good, and Raph fucks his brother's mouth according, a particular soft whine sending into him a particular sharp thrust. Leo lets out another hiss through his nose at that, and it's only a lot of experience that keeps Raph from coming right then. 
Still, he supposes Leo shouldn't get all the credit for tonight's performance. Raph, after all, was the one who decided to keep his brother on his toes with a very special edition. 
He gazes over Leo's gently rocking shell to get a better look at his prim little ass, lifted carefully in the air. His hole is flushed and straining around the hilt of one of Raph's sai, the blade glinting up proudly in the air like a victory flag. It rocks back and forth in time with Leo's little pants 
"You're slipping a little, big brother," Raph lies. "Better put that tight ass to work if you don't wanna get your pretty thighs marked up." The blade has been dulled for tonight, of course, but Leo's still determined not to fail, so he obediently clenches a little tighter, a soft kiss escaping as the pressure of cold metal on his inner walls is ruined. 
"Easy," Raph croons, petting his hand down Leo's head. "Easy, baby." Leo leans down into the touch a little and then Raph gives his hips another vicious snap, pushing Leo's shoulder so that he's jolted back onto the plug. Leo lets out a squeal that still's pretty despite being muffled, eyes flicking up to glare at Raph. 
"Yeah, sure, glare all you want. Want me to stuff you from both ends when I'm done? Let you hold my sai for the rest of the night?" It's actually a pretty sweet image, the two things he values so much so neatly fitted together, but Leo disappoints him by obediently going back to his work. 
Raph sighs and lets himself relax into Leo's mouth, feeling heat start to build in his groin. If he tilts his head a little he can see that Leo's poor untouched cock is getting hard, hanging down like a cute little reversal of the sai rising up out of his ass. He's obediently keeping it from rubbing too much against the blankets, though, not wanting to test Raph tonight. 
Such patience will be rewarded, of course--eventually. Raph is planning to wait until he's lubricated his brother's musical little throat good and proper, had a bit of time to recharge, and then switched positions with his sai. 
It'll be interesting to see what Leo's ass will feel like after clutching so obediently around the heavy hilt. More interesting, still, to see what kind of sounds Leo will give him when he comes with it clenched in his mouth like a horse's bit, neighing and crumbling for Raph's pleasure and Raph's pleasure alone.