Fucking My Virgin Sister

................ Well it all started out so innocently (WEG) my sister and I were invited to stay at grandma's for the weekend , I haven't been there since graduating college and neither has my sis (she's in her teens) and still in college . I walked in and grandma and Olivia were in a deep discussion about the birds and the bees, it seems my sis has never been laid, unreal ,lol she's almost 20....Naturally when I show up the conversation changes, Granny gives me a big old hug (I love that rack of hers) and for an old bitch she sure is HOT, she has her weekend tennis league to go to so sis and I head to the pool while we wait for her return......... nosing around I ask sis what she and granny was chatting about , reluctantly she tells me, I guess her hormones are starting to come out because she has met this guy and she wants to fuck him BUT she has never been with a guy before ( I about crapped) " really" I said , with your looks you've never been fucked ? "No" she says....... when we were kids we used to sneak into grandmas moonshine so I decided to look for it,... bingo there it is , so we have a few glasses one thing leads to another and soon we are both skinny dipping like we used to ......mmmm does my sister have a HOT teenage body, (very,very fuckable she is),.... she starts to put some sun block on me, I suggest putting some on my cock........ she's only stroked her boyfriend off once, he wanted her to suck it ,but she declined him because she is so young and still has her braces on ....I said try sucking mine, and suck it she does......never had a cock in that pussy huh, well I am going to make you a woman today and proceeded to fuck that virgin tight pussy, (I'm in with one thrust),.... she screams with pain, but soon that passes for pleasure..............there we are fucking away on the patio and who shows up, you guessed it, there is grandma (Sally D'angelo) and man is she pissed off........