[MF] I (26M) cheated on my girlfriend (24F) with her sister (18F)

Happened recently. I apologize if I don’t convey the story well, I’m not a good story teller.

I’ve been with my girlfriend for 3 years. We have a happy relationship. Her sister, for the past 6 months, have been talking with me and hugs me a lot more often now than she usually did.
Her sister and I have a lot more in common than my girlfriend and I, so that’s why she likes talking to me.

About three days ago, my girlfriend told me to buy something and drop off something at her house. Her sister was home from school because of a local holiday.

When I arrived at her house, her sister was wearing a see through shirt with just her underwear on. I was shocked. I didn’t know what to do. The sister started kissing me, first with lips then we tongue. She led me to her room and told me to sit down. The sister rubbed my groin. I already knew what she wants. I took off my pants. She started deepthroated me (something her sister never does) and I felt like I was gonna lose it. To help me last longer, I licked her clit and her pussy lips. She was moaning so loud, which made me even crazier. I wasn’t gonna stop until she comes. She came so much that I saw her pussy twitching. She needed a moment. When she was ready, I slowly popped my cock inside her. I kissed her passionately, with tongue and in her body. Eventually, I came inside of her, balls deep. She asked if we can keep doing this. I said yes automatically because I was in ecstasy.

Since then, we’ve been sexting and she’s been sending some NSFW pictures

I feel bad, but at the same time, her sister is really cute and sexy.

Source: reddit.com/r/gonewildstories/comments/12sc22l/mf_i_26m_cheated_on_my_girlfriend_24f_with_her