In her pussy?

"Go ahead," Clara said. "Cum inside me."

The Doctor grunted as he started to cum. Clara gasped and smiled and lifted her head up to laugh/moan as he exploded inside her.

"Yes, Vance!" she cried. "Cum in my pussy!"

He came long and hard, filling her up with his jizz. She came hard on top of him at the same time. Finally, she collapsed on top of him, both sweating and breathing hard.

The Doctor realized that finally his hard on was softening and his urges were at least somewhat abated. Clara got off him 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."