More waves

As you lather up Kate's back with soap, you send another wave of desire through her body. You can feel her shiver slightly, and her ass pushes back enough to touch your cock.

"Oh!" Kate exclaims, recoiling, "Sorry, I didn't mean to touch it"

"Don't worry," your hands knead her shoulders, and you send yet another wave as you do so. Your cock is quickly becoming erect, and you can't avoid it from poking into the small of her back. She giggles as she feels you.

"I didn't know you liked me so much," she says, rubbing her back against your cock ever so subtly. You wonder if she thinks you notice.

"I just came in here to wash your back," you say, as you lean in and push your cock fully against her ass and back, simultaneously sending a wave through her. She groans now, and her body responds on its own, grinding into your erect cock. You let go of her shoulders and grab her, pulling her body into yours.

"Did you want to do something else?" you whisper in her ear.