Teaching my sister_(1)

It sure was quiet in the house. My parents were over at a friend’s house for a birthday party and I knew they wouldn’t be home until very late. My 17 year old sister, Robin, was out with her boyfriend, doing who knew what. I was tired from my busy work week and collage classes and was spending a rare weekend night home alone.

My mind drifted to my baby sister. She was beautiful and I wondered if her boyfriend was boning her. Her long raven colored hair, green eyes and big knockers would drive any guy wild. I know I got serious boners when she walked around the house braless with her tits bouncing against her tank top. I caught quite a few glimpses of her nipples pressing against the stretched fabric and could tell her they were huge. I would have given anything to push her top up and run my tongue over them. I spent a lot of time whacking off while thinking of her topless.

I was just thinking of shoving my hand down my shorts to stroke my hard cock when I heard a car in the driveway. A minute later my sister ran in and slammed the door shut. I could see she had been crying. She was wearing a cute blouse that just showed of the tops of her mounds a little bit and her shirt was hugging her ass. It didn’t help my hard on one bit and I threw a pillow on my lap.

“What’s the matter sis? Did you and Danny break up?” Robin looked up, surprised to see me there. She blushed a deep red and I was shocked to see her bite her lip. “No, he’s mad at me cause I wouldn’t do something he wanted. So he brought me home. I don’t know what I’m going to do. I don’t want to lose him”

This was interesting I thought. “What did he want you to do?” I was picturing her bending over the couch while I, err, I mean Danny fucked her from behind.

“Oh I can’t tell you. I’m so embarrassed.” Robin said as she dropped her head in shame and blushed even deeper. “I feel so stupid cause I want to do it but I don’t know how.”
“Do what?” I asked as I squirmed to move my cock that was pushing against my shorts. “Do what? You can tell me. Maybe I can help. Come here, sit next to me and tell me what happened. I won’t laugh or judge you, I just want to help.”

Robin slowly shuffled across the room and dropped down about a foot away from me. I could feel the heat coming off her body and wondered if she was worked up. “Humm, she said, this is hard to tell you but I really need help and I don’t know who else to ask.”
I put my arm around her and gave her a half hug.