SONE-800 _The secret of a good lover

Rei and her boyfriend have been best friends since childhood, they officially dated 3 years ago. The boyfriend always feels lucky to be able to meet a beautiful, innocent and pure girl like Rei. But one day he accidentally looked at Rei's phone while she was falling asleep in bed because she was flirting with her ex-lover last night. And what he discovered was also Rei's sex video last night. After Rei learned that her boyfriend had stolen her phone, she also confessed that while she was with him, Rei had slept and had sex with many other birds. However, instead of being angry and giving Rei a slap, his boyfriend felt excited when he saw Rei being fucked by other girls, so he made a proposal that no one expected...