The headphones look kind of ridiculous, Raph has to be honest, especially the modified kind that they need for Leo's ear slits. But it has to be done; Leo's hearing is too keen, despite the black silk blindfold pulled tightly over his eyes. Even now, he could probably get a decent sensation of where anyone else stood in the room, depending on how hard they displaced their feet. 
Except for Raph, of course. Raph knows how to be quiet, and he knows the exact way Leo tenses when he's straining his magnificent senses and not finding what he needs. Maybe he can smell Raph, but Raph doubts it; their mingled arousal is so thick and heavy it's almost impossible to find specifics. 
Raph's theory is confirmed when he makes his way towards the bed and Leo's level of tension doesn't change a watch. He's still stiff and careful, waiting, staying carefully upright as he kneels before the headboard. The ropes around his wrists and ankles don't quiver, and there's no sign of any wear. 
Well, no time like the present. Raph unfolds the chin, delicate in his hand and takes a minute scanning his brother's body, looking for a good place to land his first way. When he swings, he does so carefully, making sure not to disturb the air in a place where Leo can sense it. 
The cane cracks between Leo's ass cheeks, a vicious little blow that his brother probably thought they would build up to instead. Leo groans around his gag, tension in his body shifting from the careful plotting of combat to the more restrained stillness of anticipated punishment. 
Another blow, across his thighs, and a third, along his calves. Raph almost goes for the back of the knees--but no, knees are off limits, unless it's been planned beforehand. The ankles, then, where Leo's been strapped down, just along the places rubbed slightly raw. 
Then back up again, further and further. Leo's nostrils flare and he's moving like he's been electrocuted, short, sharp little jerks, hands clenching in his restraints. Raph abruptly steps up to lash some of the more sensitive places on his shell before heading back to the ankles, doing his best to break up the pattern. 
All Leo knows right now is darkness and pain--darkness, pain, and the weight of his own cock, heavy against the bedsheets. He won't come from Raph hitting him, but he'll get close, real close; as Raph delivers a barrage of lashes to his brother's rear, he swears Leo's cock can see him start to leak, pleasure shimmering between his legs. 
Raph gets up the torment until Leo is bruised and reddened all over, Raph's color swirling across his scales. His chest heaves, muscles shuddering, and if Raph took the mask off he knows the eyes looking back would be wild. 
A round good round of work, overall. Time for stage two. Raph snatches up a bottle of lube from the desk and kneels before Leo's crimson bottom, wetting his fingers to open him up. Leo lets out what sounds like a muffled sigh, head hanging low as he visibly tries to relax. He probably thinks he knows what's about to get thrust into him. 
Raph shoots a smile down at the cane lying beside him, the stout, dark handle waiting to be slicked up and put to good use. Leo will figure it out soon enough.