Facing him on the edge of the tub?

"Sit here," the Doctor said, indicating the edge of the tub closest to him.

"Yes, sir," Clara purred and stepped out of the tub. She leaned back and sat on its outer edge, spreading her legs. Her tip toes touched the ground and she balanced herself by placing her arms beside her; her hands gripping the edge of the tub.

The Doctor moved up to her and bent his legs slightly as he guided his cock up to her sweet pussy. He rubbed the head of his cock against her wet slit and she gasped as she watched him. Then he slid his cock into her and wrapped his arms around her petite body. Clara moaned as he began to push in and out of her, and she bucked and pressed herself against him with each thrust.

He looked into her eyes as he began to pick up the pace and the room was filled with the sounds of their breathing and moaning and the slapping of their wet bodies.

After a few long moments of frenzied love making, the Doctor whispered. "I'm getting close," as his legs began to shake with excited weakness.