Rod and Nicky in Avenue Q are this way too. From the song "It Sucks to be Me":
Rod: We live together -
Nicky: We're close as people can get.
Rod: We've been the best of buddies,
Nicky: Ever since the day we met.
Rod: So he knows lots of ways to make me really upset!
Rod: Oh, every day is an aggravation -
Nicky: Come on, that's an exaggeration!
Rod: You leave your clothes out, you put your feet on my chair.
Nicky: Oh yeah? You do such anal things like ironing your underwear!
Rod: You make the very small apartment we share a Hell!
Nicky: So do you! That's why I'm in Hell too!
- By the end of the play, Nicky finds Rod a boyfriend to make up for outing him at Brian and Christmas Eve's wedding.