"Sorry I zapped ya. You okay?"Of course I am. Goes away pretty quick. You were great though! I just wish I could've heard what else you said to her......"Just then the song ‘Crazy’ by Patsy Cline came on.Nikki quickly stood up. "I have to go! I forgot something in the room. You gonna hang out here for a while yet?" Yeah. Actually, the guys in the back there were talking about maybe playing some volleyball too so, I was thinkin I'd join em..." Sounds good, sweetie. Have fun. Just remember, we told. Elise nodded. "I was thinking that too. Not sure if it's good or bad though." Yeah, I know. We should probably be on our toes when we get home."The rest of the walk to school I drifted slightly behind. Mostly because I wanted to think about mom's odd behavior and what it might mean. But partly just so I could watch my little sister's perfect, tight ass flex and wiggle. Then I wondered if it was still incest if I just fucked her in the ass.I smiled as I imagined spreading those tight cheeks wide. My butt cheeks involuntarily twitched for minutes afterwards from the residual bliss as Lena's fingernails dug deep in each. After slowly recovering, I positioned her on top of me for an hour long cowgirl session. Both of us were in a froth the whole time because we could watch in the moonlit mirror together as my hands cupped her pert ass cheeks and my cock disappeared between them. She fucked like a bunny rabbit...never taking her eyes off the mirror. Her pumps so violent, that I had to. Heather instantly started crying and started to protest but Cindy jerked her up and shoved her toward the door.Heather ran from the room as Cindy turned toward the others muttering "Dumb, stupid slut." We heard Heather's car leave almost instantly. Putting her arm around my shoulder Cindy stared at the two girl who were speechless. "Kneel Stephanie," she commanded. I obeyed falling quickly to my knees. Patting my head she said. "That's a good sissy. Stay just like that, while I explain.".