It was a frustrating evening with my girlfried at the movies. She teased me mercelicly

I had just gotten home from seeing a movie with my girlfriend. I hadn’t managed to get anywhere with her other than a little petting. I had hoped we would have gone further after dating for two months. I still had a huge erection when I got home, so thinking that everybody else (Mom, my sister and brother) was asleep, I started masturbating on the couch. I had photo of my sister in a bikini bottoms only and boy was she hot. I was just about to cum when my sister, Lacy, walked in. I was caught, as they say, with my pants down. I wasn’t able to stop myself from cumming though, so I was doubly embarrassed when she saw the photo. Lacy a sexy sixteen year old stared at me for a minute and then went into her room. I went to bed, wondering what she would do.

The next morning I woke up to find my Mom had taken my brother to a hockey tournament for the day. Lacy and I were to do a couple of jobs, but other than that we would be free to do as we pleased. As I went to wake Lacy up, I figured now would be a good time to question her about last night. After waking her up and explaining where Mom and my brother were I cautiously asked her “So what are you going to do to your brother?”