Problematic Truth Or Dare Game

I attended what was supposed to be a "girl's sleepover" hosted by my best friend. There were four of us in the group, all female and 15 years old.

I enter best friend's home and was greeted by two of them. All we had to do now is wait for the last person. Little did I know, the group agreed to inviting a few more classmates for the night (three males, also 15). One of them happened to be my boyfriend, but no one was aware of the fact at the time. We've been dating for only 2 months.

Hours later, everyone voted on playing truth or dare. The game started off as friendly, but evolved to more inappropriate questions and dares (do you touch yourself, do you read nsfw, and more). I could tell that everybody was in the mood. My boyfriend was next and chose dare instead of truth. Someone from the group dares him to unzip his pants in front of the group, so he stands up and follows their request. We were all giggling and making comments on how big his dick could be. For some reason, I wasn't uncomfortable or upset. I found it pleasing seeing my boyfriend like that.

After taking turns, the game mainly focused on taking off articles of clothing. My boyfriend kept taking dares, undressing until he was (the only one) naked down there. He was rock hard from the exposure. My best friend suggests that he picks someone to go down on him. He points at me, all of our friends reacting with shock and excitement. He drags me to the bathroom and shoves my head closer to his member. I began by licking the tip and teasing him. Afterwards, I was sucking his cock down while using my other hand to play with my clit. I could hear my friends listening from behind the door, so I began sucking harder. I wanted to show them that he was mine and only mine. He pumped his seed inside my mouth, calling me a good girl. We continued kissing near the sink and suddenly heard knocking. Friend tells us that best friend's older sister was on her way here. My boyfriend and I jumped and put back our clothes on. We left the bathroom, still horny and sweating from the experience.

My best friend's older sister arrives and checks on us in the bedroom. Tried to block my boyfriend's shirt, which was slightly covered with white stains. Older sister looks outside the room and we all realised that the bathroom lights were still open. Everybody in the group responds nervously, saying that best friend was simply brushing her teeth and forgot to close the lights. Older sister didn't think much of it and leaves to her bedroom. One of our friends had to leave early and we continued the sleepover normally.

Days later, my best friend sits next to me in the cafeteria to discuss the crazy sleepover we had. She tells me that her older sister went up to her and questions the strange goo she found in the toilet seat. She also discovered tissues we used to wipe ourselves. Best friend's sister got the hint that we were doing inappropriate things when she was gone. I look at my best friend stunned, praying that they don't tell this suspicion to anyone else. Told my boyfriend about it, luckily nobody never brought it up. It was awkward when my best friend would invite me to her house, having to face her older sister.

My boyfriend and I have broken up, but we are still in touch and are friends til this day. It's enjoyable looking back to that memory, hope to experience it again.