Clara should suck his cock.

The Doctor stood beside the tub as she pulled him close and she leaned over the edge, taking his hard penis in one hand and then moving her mouth over it. He gasped loudly as her warm mouth engulfed him and slowly she began to slide her mouth up and down his length. He looked down and watched her cute face as she took him in and out of her mouth and began to slide her hand up and down his cock in time with her bobbing.

"I love your cock," she whispered between bobs.

Regardless of how fabricated her sexual urges were, Clara was amazing at fellatio. Within seconds, her hot little mouth had him ready to explode. Part of him wanted to wait, wanted to feel her sweet pussy on his cock, but he had a feeling these urges wouldn't subside any time soon regardless of an orgasm so he let it build unmolested. His legs started to shake as he could feel his cock about to burst.