You lose the bottoms and pretend not to notice

You shift slightly to make sure your bikini bottoms aren't cinched between your butt cheeks, then you wait as Tommy massages suntan lotion into your shoulders and lower back. He's certainly put plenty on, but he doesn't seem to want to stop and you're not about to tell him. His rubbing fingers feel wonderful. It's only a matter of time before...

Woosh! A gust of wind blows between you and Tommy and flips your bikini bottoms down between your legs. Your ass and most of your hairless pussy are now completely exposed to Tommy.

"Umm," he says, his fingers halting on your back just above your bare ass.

"What? Why are you stopping?" You ask, and then clench your butt so he can see how firm and tight your cheeks are.

There is an audible gulping sound before Tommy replies.

"Uh, nothing," he says.

"Good," you say, "keep going."

He resumes massaging the suntan lotion into your back and along your sides, but you can tell his fingers are straying lower on your back with each pass. His fingertips brush across the tops of your ass cheeks, then a finger dips across the top of your ass crack.

Tommy's hands sneak lower and lower, but you can tell he's too shy and nervous to grab your ass. When his fingers trace across your cheeks again you moan a little.

"That's nice," you comment.

"Oh, is that okay?" He says, seeming to ask permission to touch your ass.

"It's great," you say. "Keep it up and I might have to hire you full time."

He laughs a bit too loud. You hear the squirting sound of him filling his palm with another glob of suntan lotion. You actually tense a little with anticipation. Is the nerd going to grow a pair and finally make a move?