House saw something odd when Cameron reached out to open the door. Peeking out from under her sleeve were reddish-purple marks around her wrist. He grabbed her arm and pushed up the sleeve further.

"House, what are you-?" Cameron protested as she jerked her arm away.

But House had already figured it out. Just like any semi-competent doctor (or anyone who watched CSI), he had identified those bruises.

Ligature marks.

He smirked at her. "Looks like Cuddy's gotten kinky!"

Her furious blush was his only reply.