In her mouth?

"I'm cumming!" the Doctor said and pulled out of Clara. Clara spun and knelt in front of him, taking his dick into her mouth even as it started to spurt. She could taste her ass on his cock and it drove her wild. He came hard, filling her mouth with his cum, and she swallowed it all. A his orgasm started to die in intensity, she opened her mouth and stuck out her tongue, jerking his cock onto it as she teased the underside of his head. He watched as the last few spurts landed on her tongue as she looked up at him with those gorgeous eyes of hers.

When his lengthy orgasm finally subsided, he took a step back and realized that finally his hard on was softening and his urges were at least somewhat abated. Clara stood and turned to him; her face was flushed partly with excitement and partly now with embarrassment. She was surprised at how much she had let go and given in, and to this stranger too. Though now that her head was clear, she began to put some things together and she thought she knew who Vance really was. She kept this revelation to herself however.

When his breathing began to return to normal, the Doctor was about to say something to Clara when the lighting in the room began to dim. Soon items were disappearing; the sink, the wall fixtures and paneling, the tub. Soon he and Clara were wet and naked in a dark empty space.

"What's happening?" Clara asked, and then she too was gone.

The Doctor began to look around and was going to launch into one of his famous rants, when his vision soon went black and he was aware no more.

He awoke in his (dry) clothes, lying on the floor of his TARDIS. He stood quickly and checked himself in the mirror. He was still in the guise of the good-looking young hunk.

"So the game is still afoot?" he asked no one in particular. "Excellent."