exactly imo if i saw just that scene i would assume they are in a relationship and your just their to provide some ocasional dick. again want to make clear im not complaining or asking for changes just giving personal opinions
I get your tastes, I think, so I'm not trying to "convert" you or anything, but rather explain how I perceived it.
I think Hanna taking the lead was about three things.
With Sky's innocence and inexperience, I can imagine she'd find a first anything with a guy to be intimidating, even scary, even knowing she can trust him. Hannah taking point worked to get her worked up and into it, in a way Skyler would find more comfortable (with Hannah, to touching you while Hannah ate her, to you going down on her, to watching you and Hannah have sex while Skyler was touching you, to the morning BJ).
Secondly, I think Hannah intent was to put on a show for MC. Give him eye candy to enjoy until his involvement.
Lastly, many girls in harem situations in VNs seem to want the MC first, then slowly want to get with the other girls. In this case, Hannah is already with the MC, and the other girls is less a treat (or allowance she works her way into being into) in this game, and more something she wants to experience with the MC. And considering she is the one who pushes the idea hoping MC will accept it, and not the other way around, it seems she is VERY interested in playing with the girls herself. Something she feels she can get away with, in this case, by way of points one and two: easing Skyler in, and putting on a show.
I see the MC as more... waiting for the right time to involve himself, not being forgotten, even briefly.
I do wish the MC and Skyler kissed though. That's the biggest issue of it focusing on the girls together, and less on Skyler and the MC, that stuck out to me. However, this means Sky still has not (to our knowledge) kissed a boy. And she seems to strongly consider having sex, next time, as well as being eager for next time.
I don't think the girl/girl element will be as strongly focused on in the Emily threesome, and I think Skyler will be more comfortable, more eager, and therefore more involved, with the MC the next time they get together.