Amy reached around and grabbed my balls. Then she used them to drag my cock forward. To plant me in my sister's snatch. I went forward as far as I could go. About half my bare dick was now buried in Brianna. Again, I pulled back. This time Amy allowed it.

"Help your sister," Amy said. I looked up and saw she was speaking to Jenna. "Come on!"

Jenna hesitated.

"Jeez, it's no big deal," Amy said, "You're twins so it doesn't count."

Jenna leaned forward carefully and put her hand on Brianna's boob.

"That's it," Amy said, "Rub it a little. Like, pretend you're doing it to yourself."

"I...