Searched, need addt'l help to find story

[chrisjames1122]

I am looking for a story where the main character, a boy is a delivery person for the family pizza store and when he goes on a delivery run, the customer finds out he is a sissy. The customer ends up "training" the sissy through one on one time and a few outings to group parties (I believe one person ends up being the kid's former math teacher?). Near the end of the series the boy/girl decides to stay a girl and goes to the prom with a then steady boyfriend, who believes the original customer is the girl's uncle.

I've tried just about every combination of tags search, title search, even a meta search on Google for any combination of "pizza delivery, boy/girl, sissy, prom"

I'd appreciate it if anyone could help me, I'm hoping the story is still on here/not been deleted. Thanks in advance.