The gay presence on ABC's Grey's Anatomy is about to double, if only for an episode.

According to TV Guide, girlfriends Callie (Sara Ramirez) and Arizona (Jessica Capshaw), a.k.a. Calzona, will share screen time with boyfriends Jeff and Aaron in an early 2010 episode.

The male couple, in their 30s, checks into Seattle Grace when Aaron, an overweight opera singer, becomes ill. Aaron will be supported by his husband Jeff, who works as a teacher.

Grey's Anatomy is looking for an actor to play Aaron who can sing a cappella.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.