I was in high school and I was just over a year with my beautiful girlfriend Lizette, she was slim, pretty face, small tits and a small but beautiful ass, round and firm. She and I were still virgins, but she gave me simply epic blowjobs, facefuck, no hands, until cum and swallowing. Everything was great and we were quite perverted, constantly touching, kissing and she would come down to give me blowjobs as soon as she had a chance.
She did a party at her house and invited some of our own and friends of hers that I didn’t know.
The party was going well, alcohol, dances etc., there was no supervision of other adults so everything was great.
It turns out that one of the guys that I didn’t know was her “ex-boyfriend” I put it in quotes because it had only been a silly relationship as children, holding hands, some kisses or superficial touching, 4 months and that’s it, then they became just friends. It didn’t bother me since she told me how it hadn’t been a big deal, and because of how I met her and how we progressed and saw that everything sexual was new to her, I believed it.