I 100% agree with VirtualSkeptic. I see the same facts. "Relationship"-wise, at the very most, they are companions/friends...and just tolerating eachother at this point without all the fancy jetsetting to offset the ass wiping and phlegmy nattering. Sometimes, for the sake of the charade, she needs to kiss him or put her arms around him, but even those physical gestures look forced. There is nothing romantic or sexual between them. I'm sure he tries to perv on her sometimes but most likely he gets nowhere with that. I've said before that this was a job opportunity for Hannah, and he recasted his "nurse/girlfriend" with someone who has minimal boundaries, a strong stomach, and crazy/socially inept enough to go the stretch with him. No matter how nutty she might get, this is the best he will ever do. Hannah is essential to his brand and image. Those other 2 similar blondes realized it was bleeping nuts to commit to these shenanigans for the long haul.
She has no desire for a side piece either because I believe she's asexual with some exhibitionist tendencies - she gets her gratification without having to have sex by "innocently" showing off her t & a to the public/viewers. And "working" for Shane, she doesn't have to go to a real job, bathe regularly, or talk to anyone outside of her 2-3 person bubble - which is perfect for her. They're both messy.