Mouth!

In her mouth of course!

You go around the other side of the bed and stare down at her tear stained face, before tearing off the gag.

"A single scream for help and I'll hurt you. Now, open wide, Bitch."

You grab her hair as she opens her mouth and you push your cock in. Holding her head up by her hair you start pumping, deeper and deeper until she's gagging on your meat.