Alcide can tell just from looking at Sookie -- short dark wig, corset, tats all over, leather pants, fingerless gloves, old-bitch makeup -- that Janice took to her. That's sweet, and Sookie is flattered by his glances and the sentiment, but mostly here is some information she will be screaming at you, Sookie-fashion: "Debbie's getting initiated into Coot's pack and she's addicted to V!" Alcide -- because we have to learn to think of him as Sookie's twin brother before we can get to know him on his own -- managing to combine both the folksy "cheese and ____" thing from Eric's dream with Sookie's own STFU earlier: "Shut the fuckin' door!"
Sookie admits to pokin' around in Janice's brain, with a tad bit of guilt, and points out that Janice was just trying to protect him, but that obviously Sookie couldn't just do the same because A) "Debbie" is code for "Bill" so of course he, being code for "myself," would want to know, and B) This is just one more reason for Alcide to come with her to the Were bar, which even in her getup is still really scary to think about. (Sookie would never let a boy protect her without first jumping everybody through a bunch of hoops to get her ass protected, which really is just a brilliant thing about Sookie Stackhouse: It's not big strong men she needs, it's big strong anybody, but they can't get the wrong idea and think it's because she's a five-foot babydoll of a person, because she has no time for the concept of actually being in danger.)
Alcide's grossed out by the idea of Debbie getting branded by the FUCrew, and is quite positive that it's just because she's a V addict and not any other reason, like her own internal grodiness, like there's a difference. He agrees to go with her, but they have to go separately, so that her disguise will actually have a point but also because he knows this will have no result, for him, other than yet another ass-kicking. She's grateful, but once he turns his head, she lets herself shiver some more. I can't blame her: This is like the first time in her life/the show that the danger hasn't just naturally come flying at her of its own accord.