A threesome in the shower.

So far during his short stay at the resort he had already participated in a couple of foursomes with a mix of a blonde, a brunette, and a redhead but a threesome would be the next best thing.

"Oh hi, Dr. Roberts!" Keri chirped, unabashed at having been discovered in the shower with Frank.

"I obeyed your orders, Doc," Frank grinned. "No Xentrex. No sex with multiple girls. Just rest."

"I guess you found the loophole with just one girl," the young doctor chuckled.

"What about two girls?" Frank asked with a sly smile.

"I guess that's okay," Katy answered. "Besides, I still need to thank you for what you did." With that, she let her lab coat drop to the floor and started undressing.

Frank's cock stiffened at the gorgeous sight of the doctor's naked body and welcomed her into the spacious glass shower.

"So how should I thank you, Frank?" Katy purred.