I don't really think she's annoying, she goes there and it's really their job to care and comfort people like her, especially since they pay for their services. I think she'd be a really great friend instead, even if she likes Akaru. ^_^ but I understand why you say that.
I feel like she was not not pushy with her feelings before and now she is supportive but will leap at the chance to get in his pants. So that can be a little annoying depending on how you look at it. But for the most part u r absolutely correct.
I find Hinaki annoying because women like her know that the services they get are basically supposed to stop at the front door, and asking for more can be detrimental to the host's relationship with management. I mean it's not real life love, but she's looking for real life love in the wrong place and expecting to be treated like it's a true relationship. But honestly in most yaoi the women are portrayed in a way I find annoying, which I assume is a classic yaoi trope created and maintained in order to make the relationship between two male characters more favorable.
I actually feel bad for Hinaki...being led on by a drug dealer isn't gonna be fun, no matter how annoying she is to my sweet cinnamon roll... Σ(っ°Д °;)っ