Sato-san in the Next Seat Who Lets Me

Short, insecure student Makabe cannot concentrate in class because of his desk-neighbor Sato. She teases him by saying her breasts got bigger and offering to let him touch them; seething with inferiority and lust, he resolves to resist by fixating on her thighs instead. The next day she arrives in a shorter skirt, reveals she overheard him, promises to show her thighs, and after school takes him to her apartment. In her bedroom she lifts her skirt, exposes her panties and bare thighs, and allows him to touch; overwhelmed, he kneels and gropes her thighs, then loses control, pins her on the bed, exposes her vagina, and penetrates her, ejaculating inside her after intense sex. The next day outside the apartment Sato praises him and invites him to do it again, while at school she continues teasing him in her summer uniform.