My Dirty Girlfriend

My names Jeff,im 24 and single. I met this girl her name was Emma,who was living in the flat above me with her dad and older b*****r,one evening we got chatting..She is 5'4" very petite with milky skin and long brown hair and very lovely tits. I started seeing her and we had sex every night. About 4 months into our relationship her uncle started to come round more often and she would be late in coming down to see me..I didnt think anything of it of course as its her uncle and you only hear of stories and don't believe them. He had split from his wife and needed a place to live and of course Emma's dad agreed for him to stay a while. Emma started to be lazy and asked me to come upto her room on evenings which I was a little worried about because her dad was about and her uncle. We had sex loads of times in her room and the amount of times she sucked me off was amazing..She wouldnt swallow me but instead keep it in her mouth and head off over to the bin and spit it out. One evening I went up to her flat and knocked on the door..2 minutes later she answered and she was wearing pink jogging bottoms and pants,I asked if I could come in but she said she didnt want to see me tonight...I was gutted to be honest as I was horny as hell. I tried to seduce her by giving her a few sexy kisses and a stroke here and there of her body. She wasn't wearing anything underneath her jogging bottoms and her nipples where poking through...really turning me on but she still insisted on me going back home. As we were on the 2nd floor of the flat there was 2 flights of stairs to the main door which was coded to get in..when I heard the door go ...then I heard foot steps up the stairs when It was then I turned around to look down the stairs when I saw her uncle,he was wearing a t-shirt,shorts and a pair of sandals,I mean it was warm but I thought it was a bit too little really and he was holding a can of lager. He said hello to me and went into her flat. I said whats he doing? and she said he is seeing to my computer as its not logging in..I said I can do that,She said yeah I know but he set up my pc long before so he knows it..I started to feel a little jealousy and annoyed at Emma. I kissed her and started to get into a sexy groove with her trying to tempt her into letting me stay to fuck her brains out..but to no avail.she eventually told me to leave. I said ok see you tomorrow and gave her a peck on the cheek and went..Outside the flat I saw the bedroom light go on in her room which i Knew the pc was in and my mind started wondering 'what if',"nah" I said to myself..and with that I went for a walk ,I walked for about 5 minutes and my mind got the better of me so I turned around and headed for Emma's flat. I noticed when I got there her bedroom light was off but her b*****rs bedroom was on then I noticed the drain pipe right outside his bedroom,so I started to climb up and got to the level of the window,I made sure nobody was around to see and the street light was not working so it was pretty dark and then I leaned over to view into the bedroom, I got the shock off my life and nearly fell off. I was staring at my girlfriend Emma giving her uncle a blow job in the chair in her b*****rs bedroom..proper going for it,spitting on it and licking up and down his dick which was bigger than mine,I was so angry and jealous and also getting turned on.I kept on watching for about 4 minutes when she got up and sat on top of him and fucked him...omg my dick started to grow as I was watching her fuck her own uncle and moan like ive never heard her moan before,he was pulling her hair and fucking her and then her bent her over the bed and fucked her..My hands started to ache and I had to come down...I wanted to call at her door but I couldnt..I needed to look and with that I went back up he was fucking her proper hard and she was loving every minute of it..dirty fucker I thought,this is my dirty girlfriend fucking her dirty uncle..and then to make matters worse he pulled out and twisted her around to which she got on her knees and opened her mouth for him to cum in her mouth,I watched as my dick grew hard again as to what I was seeing my girlfriend taking his cum and swallowing all of it..at that moment I couldnt take no more of it and for the first time I came in my own pants with out even touching my cock...I climbed down the pipe and went into my flat and had a shower which lasted about 30 minutes pondering over my dirty girlfriend. More later if you like that one. Names have been changed but the story is more or less true..sorry its a long story before anything happens..