I feel like the author is kind of calling out general harems with the bonus chapter, and I love it. She made a work where the protag is aware of her sexuality, is interested in and interactive with each member of the harem, and each member of the harem as others have been discussing is into her for a different sense.
Compared to a decent amount of hetero harems, where the guy is generally unaware and dense, he's not actively into the harem members and so there's not a lot of back and fourth, the girls are also just into him simply because he's protag guy. There's also Reverse Harems (girl has guys that revolve around her, not sure if there's a better name), where from what I've seen of them they tend to have a lot of very abusive and mean guys, that for some reason are supposed to be love interests.
I don't want to be too generalizing here, as there's many works of all different kinds. So I'm only sharing some of my personal experiences, and also saying I'm so far loving how the author is handling this harem dynamic, but I guess we'll see how it goes.