He could push this to a head now, but it would be ...inelegant. Prolonging this experiment would be better. It'd give him something to work on in his downtime, just to keep himself sharp. It could also hurt Kitty and Sean much, much more if he drew it out. Wasting all that potential on a brief thrill would be ridiculous. He'd poisoned the water nourishing their little garden, and now he could watch it grow just a little bit twisted for a while. Not to mention that by seeming to give Kitty a concession, he could make her feel like she owed him.
So he stepped back enough to let her breath easily, one hand held up palm first to her, his voice changing in tone to almost soothing.
"I won't. Calm down." He dropped his hand. "But now you see. There are things in you as ugly as anyone else. For the record, the next time someone asks permission to do anything like this...it'd be better to say no. So let's call it a lesson learned, shall we?"