While taking after-school lessons from his homeroom teacher, Kimijima-sensei, in the school library, Shota can't help but be curious about her big boobs. As he plays all sorts of pranks on her, it escalates into sex! Health teacher Tsujii happens to witness the whole thing and is left confused! This incident leads to Shota having the huge boobs of the two busty teachers, the pride of the school, all to himself! He gets them to show him their boobs and pussies in the health room, strips them naked in the principal's office and makes them jump rope, completely going beyond the scope of pranks! In the end, he gives them both a titjob at the same time! He gives them a blowjob! And even has a threesome!