Because they wanted to improve their knowledge to prepare for the upcoming university exam, the young couple invited each other to their house to study in a group. After sitting at the table for a while, the two seemed to have forgotten the original purpose, instead of learning the knowledge in class, the two were curious, wanted to explore each other, they learned each other's knowledge about sex. Immediately followed by sex between the two of them, this is perhaps the most memorable group lesson because it has opened the door to maturity and understanding of sex that they have never experienced.
