My sister and I have always been really close since we are twin well fraternal twin only because I'm a guy. My sister has never been one for violence and fighting and yelling. So when our parents would fight at night she would alway just come climb into my bed and lay there with me trying to not hear it. Eventually our parents divorced but we had gotten so use to sleeping in the same bed that we chose to share a room in our new house that way we didn't have to worry about the whole bed thing. Since we shared the room we saw each other naked a lot which after so long was like nothing and we'd do it all the time. We had a bathroom attached to our room so when we would get out of the shower we'd just walk into our room naked. As we got older I started to get attracted to my sister and when she'd walk into the room naked from her shower I'd get hard and she would see because I would get in after her. One day she said since we do everything together why don't we shower together too it'll be fun and save a lot of time. So we get in the shower and it was really the first time I noticed how much her body had developed she is 5'4 with long brown hair and green eyes with medium sized c cup boobs and a nice round butt. Everyone always laughs when they see us together because I'm a foot taller then her and she looks so small compared to me. While we shower she said let's wash each other. So as I'm washing her I get to her pussy and she pushes my hand into her and just says keep rubbing it please. As I'm rubbing her pussy she says oh I'm gonna cum keep going. She cums on my hand then she starts to pee and says sorry I really had to go and I normally pee in the shower I hope you don't mind. I said no if you don't mind me doing this and I started peeing on her back and butt. She says well it's only fair but all I did was pee on your hand now I've got pee on my back and butt I guess it's a good thing we are in the shower then. She starts to wash me and grabs my dick she says you made me feel good now it my turn. So she soaped up her hand and jerked me off I told her I was going to cum and she said turn around quick I turned and she got on her knees and said cum on my boobs I know you like them I see you staring at them all the time. As I cummed I shot a huge load and she went to say something and as she opened her mouth some of my cum shot into it and a little bit shot on her cheek too. She closed her mouth and swallowed and said wow I can't believe you just came in my mouth I told you to shoot it on my boobs. I said if you didn't like me doing that then why did you swallow it. She said I don't know but I did taste good. We got out of the shower and as we dried off and started getting dressed I got hard again and she said wow you are hard again you're such a perv getting hard over your little sister. As the years passed she would jerk me off and I'd rub her pussy till she came. Then it turned to oral sex. When we both started dating the oral slowed down a bit and the only time we'd really do anything is when we didn't get any. One night we are laying on our bed and my girlfriend calls and starts yelling at me over some stupid shit. I tell her I'm not fighting with her and hang up my phone my. Sister says wow she's being a real bitch now isn't she. I said ya she just doesn't trust me any more she thinks I'm cheating on her with another girl. My sister says well you kinda are with me. I said well we only give each other oral and that's it it's not like we are have normal sex then I said enough about that how are you and you boyfriend doing. She said oh well we broke up today he was an asshole so I dumped him. I said well sorry you two broke up but if he was an ass then he deserved it. Then my girl called me back and said don't hang up on me again because if you do I'm breaking up with you I know your cheating on me now tell me who she is. I said I'm not your just paranoid. She said don't call me that then my sister grabs the phone and says quite being such a bitch to him he hasn't done anything wrong. My girlfriend never really liked my sister and didn't like that she was always around me. So my sister said consider yourself dumped bitch and hung up. She said sorry you know I don't like that especially when it comes to you if I was your girlfriend I'd never be mean to you or yell at you and if you were my boyfriend then I'd never have to worry about that either and I'd have a guy with a big dick to fuck my brains out. I laughed and say ya if only and did he really have a small dick. She said compared to you he's tiny he's only like 5 inches no where close to you you have a good 3 or more inches on him easy then she said crazy idea you don't have to go with it if you don't want to but why don't we just have sex with each other and forget about dating no one can love you more then me and beside neither of us are going to be getting any sex anytime soon. She said but if you don't want to then we don't have to it was just an idea and a stupid one at that. I kisses her on the lips and said yes you don't know how long I've wanted to fuck you for. She said really me too it's just always been something about the though that turns me on. So I said let me go get a condom just to be safe as I'm getting up she pushes me back down and says no I want you to cum in my pussy I want the risk of getting knocked up by my own brother is just so fucking hot think about it me walking around with a big pregnant belly and you being the father of the baby. I said fine if your ok with it then lets do it she climbs on top of me and says put that big dick in this tiny pussy I need to be filled up with it. I slip my dick in her tight pussy and we start having sex slow at first then she says fuck me hard fuck my brains out give it to me. So I get her on all fours and start fucking her from behind and she starts to moan so I throw my hand over her mouth and tell her to be quiet or else mom will here we fucked for ten minutes before I was ready to cum I tell her I'm close and she says so am I lets cum together and you better stay in me to I want you to feel my pussy with your hot seed fill my womb and get me pregnant with your baby we both cum and I shot one of the biggest loads of my life into her. I pulled out and she said damn that's a lot of cum I might actually end up getting pregnant oh well I told you to stay in me so it's my fault. We've been having sex for around five and half years now we live in an apartment together and fucked every chance we got. We had to stop because she pregnant now and is going to be due in June just a few weeks after our 23rd birthdays. I love my sister so much.