I’m looking for a manga where the girl pushes the boy and he falls, rolls and slams his junk on a pole. The doctor exams him and they’re told that the boy has to get his balls drained of semen or his balls will die. The boy blames the girl and says she has to help him because she’s the one that pushed him. She agrees reluctantly and relieves him over and over. By the end, they’re in a relationship and have sex just got the pleasure.