You fall asleep, wrapped around each other (alternate)

That's the last thing I remember.

Becka and I are younger, cavorting naked in a lake on a family vacation. Becka lets me catch her in deep water, and she turns and kisses me. She wraps her legs around my body and we have sex in the water. She groans loudly as she comes.

I wake up slowly. Becka is no longer in bed, and then I hear another feminine groan coming from Becka's bed. She must be jilling off, I think. Then I realize that the groan sounded much more like Megan's voice. I check and she's not in bed. I open my eyes and see a glorious sight: two naked women in the sixty-nine position, obviously eating each other out. I think Becka is on top. Meg and Becka are having sex! My shaft is rock solid in two seconds.

Becka's head comes up as Meg digs into her pussy after coming. My sister looks at me, seeing I'm awake. She winks and blows me a kiss. Then she moans and her body shudders as her climax takes her. Meg must be pretty good.

Becka turns around and cuddles into Meg, kissing her. She breaks the kiss and whispers, "I have a surprise for you."

"Another surprise?" Meg whispers back.