Tammy’s door was slightly open and I could see a dim light coming from the room. When I opened the door I was greeted with the smell of incense and ...andles which were lit around the room. I only had a couple seconds to process this as what really caught my eye was the sight of my beautiful girl laying on the bed. She was completely nude except for a towel which covered her ass. My head was screaming “Get out, now.” But my feet clearly weren’t listening as I kept moving towards the bed.Tammy was. He finally arrived. We had already talked about the ground rules for us. Neither of us wanted kissing or anal, just strictly oral. I asked if he was nervous and he told me that he definitely was. I gave him a beer, turned on the porn and we lay on separate beds for a bit. After a few minutes, I got up and went to his bed.As I lay down I asked if he was still nervous as I began to rub his cock through his jeans. He told me that he was getting better. With that, I began to gently massage his cock. She laid there for a moment as her brother tackled me, and then she got up and walked out of the room without saying a word. I became afraid that I'd gone too far and feared she had just freaked out by my inappropriate touch. She was my niece, and even if she had been intentionally teasing me, there's a difference between "looking" and "touching", and based on her reaction, I feared that I'd crossed a line with her. I continued to wrestle with her brother as I mentally prepared my defense to. I was about to rummage for my keys when the door opened and Wendy, who must have been watching for me, hauled me inside, slammed the door and jammed me against the wall as she started pulling at my clothes and seeing how far she could get her tongue down my throat. In a reciprocal spirit I fumbled to try to remove her clothing only for my fingers to find nothing but bare skin.I know I should have been taken aback by this but to tell the truth I had half expected something of the kind,.