In order to prepare well for the upcoming university entrance exam, the younger brother asked his parents for permission to stay in the city with his older brother and his girlfriend for a few months to study, accompanied by the older brother's girlfriend - a beautiful, talented girl who is currently a student at a prestigious university. The older brother is very kind, always reminding his girlfriend to frequently tutor the younger brother, while the girlfriend dresses very provocatively and seductively, especially when teaching at home. There have been many times when the younger brother had to try to control himself after accidentally seeing the sensitive areas of his brother's girlfriend. However, temptation grew over time, and during one tutoring session, she unintentionally struck a very seductive pose on the bed, revealing her underwear and voluptuous buttocks. This time, the younger brother could not resist anymore, so he boldly approached from behind and quickly inserted himself while she was caught off guard. Expecting to be scolded afterwards, he apologized nervously, but to his surprise, she wanted him to continue with that act once again.