Saito is a classmate who sits next to me. She is very mischievous and likes to tease me. Today, I will regain my pride! I challenge her to guess what I have placed inside my box. I am confident that I have sealed it tightly and even prepared a second box inside so she cannot know what is inside. But without opening the box, she already knew I hid an eraser inside it! The next day, she brought a box to challenge me. The loser must obey the winner. And the result is the same, I have never been able to beat her. And when she expressed her request, I could hardly believe my ears anymore. "Let's have sex." Saito began to kiss me, undressed, and passionately sucked my penis! Then I inserted my penis into Saito's wet vagina, and our moans echoed throughout the classroom!!! The library, the gym, the infirmary, outdoors, etc. I could not resist her temptation!!! We became closer, I took the initiative to invite her home, and we gradually developed feelings for each other...