
There is a girl who is a student at a tailoring school. She has a friend who has a boyfriend and is always having sex. She herself, however, remains a virgin. She sees her brother masturbating one day. She asks her friend (the same one who has a boyfriend) to have sex with her brother. Her friend asks her to spread it for her older brother in exchange. It is a deal and the four go on a hike.
Cheating Notes

Aside from the main character's brother, the friend (who has a boyfriend) also fucks another guy. Not sure who he is, I thought he is her older brother whom she introduces to the main character, and who also becomes the latter's love interest later, but her older brother could be the nerdy-looking one with the eyeglasses.
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