i’d recommend looking in the Innocent!Dan tag but here is a short series i can think of

Babygirl - phandomsub

Summary: Dan is an innocent virgin and Phil is the bad-boy who likes to make him flustered. High school Pastel!Dan and Punk!Phil AU

Daddy's Little Princess - phandomsub

Summary: Dan's still a shy, easily-flustered virgin, but Phil can fix that. High school Pastel!Dan and Punk!Phil AU

Pineapple Juice - chocolatesaucelester

Summary: Phil teaches Dan how to give a blowjob.

Let Me Be Your Call Boy (ao3) - auroraphilealis (peachrosepetals), embarrassing_myself

Summary: After coming out as gay to his friends on his birthday, the last thing Dan is expecting is to be gifted a call boy as a present, let alone one that’s been paid for for the entire night. Allowing Phil to show him the ropes is his first mistake, paying him to come back every week is his second, and using him to convince his parents he really is gay is his third. As a successful lawyer, the money isn’t the problem - falling in love is

We’re Diving In, There’s Nothing Left To Lose - cuddlephan

Summary: Phil is Dan’s older friend and finds it adorable how Dan knows absolutely nothing about anything remotely sexual, so Phil teaches him stuff like masturbation.

Innocence - paradisobound

Dan was always adamant about not having sex before marriage. But one day he decides he wants to try it with his boyfriend, Phil. But he has one condition: he doesn’t want to see Phil’s dick during sex.