The obvious way.

Zack moaned softly as Sarah pressed herself into him. Her legs intertwined with his as she embraced him and placed his hands on her hips. She reached her arms past his head to take the shampoo off the shelf behind him. Getting a handful, she slowly began to lather it into his hair.

His scalp tingled as she massaged the shampoo into it. At the same time, she swayed her body slightly, moving her left breast across his chest. Abruptly she tilted his head back into the stream of water to rinse the shampoo out of his hair. At the same time she frantically kissed his chest, starting under his chin and moving down to his clavicles and nipples.

God, this was the hottest fucking thing that had ever happened to Zack. He moved his hands up her back to cradle her neck, holding her head against her chest. She laughed softly into him and grabbed the body wash from the shelf. After squirting a handful into a washcloth, she embraced him and slowly rubbed it across his back.

As she reached down past his lower back and tailbone, her hands came around to gently scrub his abdomen. She moved down from there and began to gently tickle his manhood. He gasped involuntary, which drew a sultry chuckle from her. "Enjoying it?" He nodded speechlessly and she winked. "Not as much as I am."

Suddenly Sarah dropped the washcloth and, in one motion, put a hand against his back to draw him in and pivoted to bring her back against the wall. "Enough hygiene," she said huskily, and gripped his shaft. She positioned it at her entrance and, grabbing his ass, slammed him into herself.

Zack grunted heavily at the sudden warm tightness around him. She gave an open-mouth smile as he pulled back, then pumped in again. Sarah bit her lip and her eyes went half-lidded as Zack began to rhythmically thrust.

As they picked up speed, he put one hand against the wall behind her and another to the back of her head, drawing her in for a kiss. They locked lips and she pulled his hand down to her firm but yielding breasts. He explored them eagerly, eliciting a gasp from Sarah.

"Oh my God, Zack, yes!" She pushed her chest up as he pumped into her. She placed a hand on the back of his head and brought it down to meet her heaving chest. As he greedily began to kiss her, she let out a desperately inarticulate cry. He sucked at her left nipple, small and protruding, she let out a sound between a sob and a laugh and shuddered violently. A second later her joined her, emptying his seed into her with a **** he'd never experienced before while she screamed in pleasure. After what seemed like an eternity, they stopped thrusting and relaxed into one another.