She interrupted me again, lightly stroking my dick. 'I liked it, Pete. I liked it. In fact I've never been so turned on in my life, knowing you were watching me. It's not wrong. This is not wrong,' she said, looking down at my brand new hard-on. 'Do I look wrong to you?'

'No Rosie, you look fantastic.' I was really getting into the hand job my sister was giving me. My animal lust was picking up right where it left off minutes ago. 'I've been thinking about you 'that way' for weeks.'

'What way?' she asked. She looked at me intently, spreading her legs to expose her smooth pink...