Big Mistake

It wasn't long before Jon and Greg were going at it, Jon just couldn't resist the feelings of Karyn's body. He also felt a little bad having sex with Zoe's boyfriend...He began to obsess. This was good. Was this what sex was like for Karyn? For Zoe? Was it her boyfriend? Or would it feel this good with anyone? God, his sister was so lucky. FUCK! His body just had an orgasm. "God!" He screamed, "Oh, God!" "I wish I could feel like my sister all the time." Oh...shit....