A Lesbian Relationship on “Grey’s Anatomy”?

Warning: gay-related spoilers!

Last week we mentioned that Grey’s Anatomy was teasing viewers with a potential relationship between Callie Torres (Sara Ramirez) and Erica Hahn (Brooke Smith). But last night’s episode ("Piece of My Heart") did more than tease — it laid the groundwork for one or both of the characters to come out.

The two doctors have been shown growing closer over the last few episodes. Cristina (Sandra Oh) recently came home to the apartment she shares with Callie to find Callie and Erica sharing a bottle of wine in her living room.

In this week’s episode, Addison (Kate Walsh) returned to Seattle Grace for a surgery and grew happily suspicious after watching the body language and rapport between the two doctors. She asked Callie about it over lunch.

Callie was surprisingly defensive:

Addison: Callie, are you speaking the vagina monologues now?
Callie: What?
Addison: I’m all for it. I think it’s fantastic. Erica? She seems great. I really do like her. I do … are you?
Callie: You want to know if Erica and I are a … a couple? Because I defended her to Yang?
Addison: Because you seem like a couple. A really happy couple.
Callie: (laughing nervously) OK, that’s … that’s just … that’s insane, is … is … what it is. I like penis. I mean, I’m a huge, huge fan of penis. Ha, hilarious. You’ve been living in Los Angeles way too long. Way too long. Ha. Ha.

Addison responded with a skeptical look:

Shortly afterward, Callie asked Meredith and Cristina if anyone ever thought they were a couple. (Meredith’s response — "No, because we screw boys like whores on tequila" — was one of the funniest lines of the night.)

At the end of the episode, Addison is having drinks with Callie and Erica at the bar, and they’re all having a good time until Hahn removes a piece of hair that’s caught in Callie’s lip gloss.

Callie freezes, seeing the speculative look from Addison. Grey’s resident playboy, Mark Sloan (Eric Dane) comes over at that moment to ask if any of the women want to dance, and Callie jumps at the chance, grinding all over him on the dance floor as Hahn watches. Seeing an opportunity to play matchmaker, Addison says to Hahn, "She’s pretty, isn’t she?"

Hahn responds, "She’s beautiful," and Addison grins.

Noticing Hahn watching her, Callie asks Mark suggestively if he wants to "get out of here," and they promptly leave as Hahn looks on wistfully.

Back in October, Smith expressed enthusiasm at the idea of her character potentially being gay, telling TV Guide‘s Michael Ausiello, "I’ve certainly let [the producers] know I’m open to it" when he suggested that Dr. Hahn would make "an awesome lesbian." Initially, there was speculation that her character might be paired with Cristina, which still remains a possibility despite Callie’s recent behavior.

There have been hints that a story line like this was coming. Besides all the spoilers running rampant on the internet, Grey’s creator Shonda Rhimes wrote in a column for TV Guide earlier this month that "Callie, Erica and Mark are going to go through some changes that might surprise you."

Earlier this week, out actor T.R. Knight confirmed to USA Today that "there’s something gay" coming up on the Grey’s two-hour May 22nd season finale, saying: "I was surprised as anyone. Anytime on television that real life is reflected is a good thing."

Although she won’t reveal which characters are involved, Rhimes writes that the finale ends with "a good kiss. A great kiss. A kiss so good it makes you lean into your televisions. A kiss we never saw coming. Oh, it’s a major kiss."

Whether the kiss is between Hahn and Torres, Hahn and Cristina, or another couple entirely remains to be seen.

Watch the promo for Episode 13, "Piece of My Heart," below, or watch the whole episode on ABC.com.