Can't believe I just jerked off to my sister and she walked in on me and saw it.

I live with two of my siblings and our dad, and the other sibling happened to be my only sister. I'm the only male. She's the oldest (27) then there's a brother (25) and another (23) im 20 and then my youngest brother (17). <br><br>I know some of you would be confused as to why I'm posting here and on some level I'm not sure why I'm posting either. The title probably says it all. It was just a weird experience I thought I could share.<br><br>I actually have a girlfriend by the way, and we've been together for about two years. We're very close, extremely close. I know she's pretty special. We really can't be around each other when we go home though because we live with her parents (which is like 20 minutes away) and I have to live with my dad because he's not good at taking care of himself. So I have to come home on the weekends to make sure he's okay.<br><br>I did exactly that this past weekend. The first night was pretty uneventful. It was just a night alone with my dad and my two brothers. The following night though my sister came over. Then on the second night when my sister was there she made a comment about all of us having to watch a movie together, which none of us wanted to do. I can't remember what exactly drew all our attention away from it but the suggestion was almost forgotten. By around 10 pm though the house was empty except for me and my sister. She wasn't ready to go to bed yet and neither was I. So we both decided we should watch a movie together.<br><br>As we were setting up the movie she jokingly said that the reason why we had to watch a movie together was because she was a little horny and wanted to release all that sexual energy into something else. I jokingly replied that maybe we could release your sexual energy for you and she just rolled her eyes and laughed. She then said to me that I was "such a perv" and "such a creep" as she walked away from me. I pretty much dropped the subject right there. I didn't really know what else to say, and I didn't really expect her to say yes or anything anyway.<br><br>We finished setting up the movie, and sat down. I sat on the couch and she sat on a futon that was right in front of the TV, basically at my feet. I actually completely forgot about the whole conversation we had earlier until she started talking out of no where, asking if I was serious about the offer I made earlier. I didn't even know what to say to her. If she was actually serious I would've been more than happy to. I really made sure she was being serious though because the last thing I wanted to do was make her uncomfortable.<br><br>She was though, and she wanted me to make her feel good. So I did. I started by just feeling her ass and tugging on her clothes. I even asked if she was sure she wanted to do this. She was. So I started tugging on her clothes more and it was until that moment that I realized I was about to see my sisters pussy. I couldn't believe it, and I was excited. I never found my sister sexually attractive until she was spread out in front of me.<br><br>I started rubbing her pussy with my fingers, and I even started sticking my fingers in her a little. She really seemed to be enjoying herself, and even asked me to fuck her. I wasn't really expecting that, but I couldn't resist. I pulled my pants down, and put my dick in her. At first it was really hard to get in her because she was still wearing her jeans. I managed to get in her though, and she was so tight. I was just holding myself up with my arms and my feet. It was a little uncomfortable actually.<br><br>Anyway, she started making these really loud moans and it felt really good. I didn't even last that long. I told her I was going to cum so she said I should cum inside her. I really wanted to but I didn't because I didn't want to get her knocked up. So I asked if I should and she said yes, but then got mad when I told her I didn't have a condom. Then I told her I was going to finish in her ass, and she just rolled her eyes and said no.<br><br>So I went ahead and shot my semen into her pussy. She actually started scooping it up with her fingers and putting it into her ass, which I thought was the hottest thing ever. I wanted to fuck her ass then but she said no so I didn't. Then I really wanted her to suck my dick but she said no to that as well. I was really getting mad at her at that point.<br><br>I was actually about to get up and walk away from her but she said she would suck it for me. But not at that moment because she was still in the middle of scooping my cum into her ass. Then I started saying I wanted her to suck my dick and I wanted her to lick my balls and then I don't really remember what else. She just looked at me weird and said okay. <br><br>I got up anyway and told her I was gonna go take a shower, and she said she was going to stay where she was. I said okay and I walked away. She asked if she could use my phone to call her boyfriend and I said no. She looked at me weird again and said okay. I walked into my room from there and shut my door. Then I called my girlfriend and told her how I was doing and stuff.<br><br>Then I took a shower and got back into bed. I was about to fall asleep though when I heard my sister calling and banging on my door. I groggily opened the door for her and she immediately asked why I was calling my girlfriend and bragging. I didn't know what to say to her. I didn't really know why I was doing it. So I just didn't say anything. She looked at me really weird again and then just shut up. Then she told me she changed her mind and wanted to suck my dick and I told her no.<br><br>She said "fine, I didn't even want to anyway". I told her to stop being such a bitch and she called me a creep and a perv and she just walked away. That really just pissed me off even more. She went and slept on the couch and I just went back to bed. The following morning we just ignored each other and when our dad ended up going out I tried to talk to her but she just didn't want to. So I gave up. She was just being stubborn and I didn't want to deal with her.<br><br>I decided to stick around for one more night before I headed back home to my girlfriend. So I did. My sister made sure that night to just ignore me. She didn't even talk to me when we were alone. She actually went to her room to sleep as well. I really didn't care though. I was just preoccupied with other thoughts. My girlfriend for one. I know I did a really shitty thing to her but she actually forgave me. I begged her for forgiveness and she said it was okay.<br><br>I just really can't believe I'm actually asking for advice on this weird ass thing. I'm not even really sure why I posted this at all. Just wanted to clear my head or something I guess.