A guy gets a visit or message from an old female acquaintance that he used to play D&D with. She asks him for a favor. Taking care of a teenage girl to protect her and get her away from her family (especially her father). Guy agrees.
Later he has to marry the girl, so that father loses guardianship.
Is actually a romance story, the guy is attracted to younger girls.
Story reminds me of oyster50 stories, but I looked through his stories and couldn't find it.
Anyone know the story?