Dave rolled off Zoe and tried to hide his cock as Zoe began to chuckle. “I thought you were at the lake for the day with your friends, Sara," Zoe said. “And Sara, don’t you remember our neighbor, Dave? Dave, you’ve met my little sister, Sara. She will be 17 next month.” “Sara, we got back from tennis and Dave needed to use our shower but we, mmm, got a little carried away." “Wow”, said Sara. “That’s not fair. You told me that we were going to have him together. You know I wanted you to teach me how to do it...”