A group of close friends, both male and female. Miko, a female friend, is generally a recluse and isn't good at socializing with other girls, so she doesn't have many friends of the same sex. She's the type of girl who has always hung out with male friends. When she came over to the hotel, they decided to play a prank and make the loser "show masturbation" as a punishment. The boy who suggested it lost, and exposed his penis in front of the two girls, stroking it... Miko, seeing her male friend masturbate for the first time, became curious... and mischievously played with a vibrator, she even started helping him masturbate. Miko gradually became excited, getting into the mood and eventually licking her friend's penis and giving him a blowjob. "Isn't this the punishment game for me...?" Until yesterday, all three of them were just friends, not romantically involved, but they couldn't resist, and before they knew it, they were having sex with each other. It wasn't their intention, but one moment of curiosity turned them into a male-female relationship. After all, friendship between men and women doesn't work. The day our friendship fell apart.