Unexpected Uke--A Yakuza used to date a woman with a child--who she beats all the time. At the time, her son was in highschool. The Yakuza later on developed a soft spot for the son and stayed connected because the son would follow him around and confessed his love to the yakuza. The mother disappeared with a man even though her son was waiting for her. The Yakuza, UKE decided to sleep with the young Seme when he found out the horrible mother he has been waiting for has just been found dead.
Boku no Shiru Anata no Hanashi