The look on Chase's face in the seconds after the spank and that squeak remind him suddenly why he'd started this. That look is so much more Odile than Odette, and there's a second that it steals his attention away again.

If they were anywhere but here, he would in an instant, but they're not. He forces himself to look away, bends down and picks up his discarded towel and wipes off his hand and when he moves across the room to get a drink of water, expecting to find Chase pulling out a towel and tugging his tights back up, instead he finds him stripping down. He stops, standing by the upright piano and watches as those tights peel away, followed by the dance belt, slow and inviting like he's stripping for him. Chase, the boy who'd struggled so much to dance Odile without looking like some innocent, fragile thing was now stripping in full view, knowing that House would be watching. Oh this... this had been quite effective.

And House is just standing, staring without comment. There's nothing to say that hasn't already been said, and if there is, then he just doesn't trust himself to say anything at all when all he can think about is that perfectly round ass, and fucking it.