Trying to find a story

I'm looking for a story that i once read several months ago, but now I don't remember the title
It's about a guy who gets feminized by his girlfriend for a party, she makes him walk in heels while she's driving
Later they and their friends buy dresses and he has to spend more time wearing girl's clothes
I never read the ending, so that's all i know
I think the girl's name was Samantha, but I'm not sure