Instinctively I looked around for something to cover myself, but the cabana was bare except for a couple of pillows on a small chair near the window. I jumped up and scooted to the chair, sat down and put a pillow in my lap.
"What the fuck, man?"
Dan looked at me for a second, then started to chuckle.
"What are you hiding for?" he asked. "It isn't the first time Tina watched us."
"Where is she?"
"In our bedroom. Waiting for us."
"Whaattttt?"
"This was just Round One," he said, rolling off the air mattress. "Round Two is coming up. Come on inside."
He stood up and strolled out of the cabana and headed across the yard, stark naked.
I pulled on my shorts and followed, looking anxiously about to see whether the neighbors were watching. As far as I could tell, scurrying past the pool, no one was.
Dan was waiting for me on the covered porch. When I walked in he turned, went into the house and headed down the hallway to the back bedroom. I followed.
When we reached the bedroom door Dan went in without stopping, but I held back, a little afraid of what I might see. But curiosity - and something else; anticipation, i suppose - prompted me to step in.
Tina lay on the bed, propped up on a couple of pillows, completely naked.
I must have started a little, because she said, "Come on in, I won't bite. Much."
I took a good long look at her. Although her face told you she was past 40, her body was as beautiful as her daughter's - maybe more beautiful, because she was rounder in places that Jenny was angular, with just enough extra flesh in her hips and belly and especially in her breasts.
I'd always admired Tina's breasts when they were hidden by her clothes - not that she made much effort to hide them - but bared like this they looked magnificent, full and surprisingly firm for someone of Tina's age, with small areolas and large nipples that were fully erect.
Her legs were spread, and as I watched she turned so that her pussy came fully into view. She was completely shaven. The outer lips were pink and distended, and the inner lips were glistening with moisture. She clearly had been masturbating.
As I watched she brought a hand to her pussy and languidly fingered her clit. I felt my 18-year old cock jump.