From behind?

Clara rolled over and got onto her hands and knees. She turned back to look at the Doctor, wiggling her ass at him and giving him that sexy smile.

The Doctor knelt behind her and guided his hard cock up to her pussy from behind. He pressed his cock head against her wet, waiting sex and slowly pushed it inside her. Clara moaned and her legs shook a little as he entered her. He was very slow at first, looking down to watch his hard rod enter Clara's pussy as he grabbed her hips.

It felt so wonderful! Clara's pussy was hot and wet and held his hard cock tightly inside it. It was soft and creamy and the sensation it created all along his length drove him mad with passion. He picked up his pace until his body was slapping into her bottom as he fucked her hard from behind.

Clara moaned and squealed and they were sounds that the Doctor had never heard from her before. She was a completely different woman in the throes of passion (as were most women he assumed).

After a few short minutes of this, he could feel a huge orgasm building within him.