I'm A Cheater

Hello
This happen when I was 18 year old mixed race male.When I had a girlfriend who was 18 and she had brown hair small a-cup tits and she was a virgin and I use to stay at ur parents place which was massive.
It was like a Castle compared to my mum's house anywho one night when I was over at my girlfriend's house I was having a shower when I got out of the shower and was drying myself her 22 year old sister walked into the bathroom and sat on the toilet.She was tall slim blonde hair c cups and was smoking hot.
She looked at me and ask if I had a real blowjob before not a little kiddy one from her sister. " No I said just from your sister " she laughed while she was pissing in the toilet she opened her mouth and told me to come here she said "come here you little prev " Put it in my mouth and I'll make you cum so hard and fast " so I did and my cock grew must off been easy 20 cms long she was sucking my cock and gagging on it while I was slamming it in her warm wet mouth " o my god don't stop "
It was so good "I'm cumming ahhhh "
She swallowed every drop and not to tell her sister or a mother and I said I wouldn't I felt so guilty the way she sucked my shaft and pulled back my uncut cock all I could think about was her for the whole day as I was in my girlfriend's room watching TV and it was getting late I was grabbing my girlfriend's a cup nipples twisting them and pulling them as she was sitting this soaking her undies hmm I could feel her wetness and my cock started to grow it was getting so hard and her sister Came in and looked at us and said ' can I watch' let me know if you want a part 2