Watching her suck

Masturbation
2010-09-26

Watching Her Suck

This is a true story and I will tell it to the best of my availability.
I just got don’t eating dinner and she just got back from getting some alcohol we sing her the traditional happy birthday and we eat some cake and then she and my cousin starting drinking they finish about a six pack. I hear a knock on the door she answers it and two guys come in and they go in the backyard. Now she’s 19 and I don’t really pay too much attention to her personal life but tonight it was different. It was about 11 and I had just come back in from being on a phone call. My cousin approached me and asked if my sister was out there? This made me worry just a little and I went looking for her so we have the house and there a converted garage out back which is my room. I walked all over the backyard and notice that my light was on so I went back to open the door and it was locked this pissed me off so I went to the side and peered into the window and there it was my sister sucking this guys cock on my bed. Now I’m not a perv but it somehow turned me on my first reaction was to pound the door down but the more I watched the harder I got she was all the way down on his cock and trying to suck more. I was hot I haven’t had sex in months but anyways. She’s release his cock and goes back down and now I’m stroking my cock which I’m about six and a half and pre cum is shooting all over. I can tell he loves it as she has her top off and he is playing with her tits as she’s sucking him and he’s using the other hand on the back of her head I’m hard as a rock and stroking my cock just watching her method of sucking this guy’s cock he was about six and she was taking him all down her throat and playing with it with her tongue. She speeds up and I lose it I shoot my cum and the side of the building I hear him moan and she swallows his whole load and giggles after she gets up and I see her tits and I’m impressed they have to be a double d she gets dressed and they leave and go back to the house.

Now I’m stuck I don’t know what to do.
Do I tell her I saw everything?
Do I use it to my advantage?
I leave it up to the internet community tell me what you think I should do?