Haha that's totally because it's not so out of place for two female friends to do that even. I mean sure, she's crossing the line a little bit in this specific context but there's no context in which a girl pressing herself like that on a guy could be read as not provocative. With another girl it's just a mild sweet thing, it's not provocative like that haha.
Lot of hetero stories don't do good job at setting the stage. You'll just have a crazy woman or women throwing themselves at shy MC who doesn't even know who he likes, and it gets unpleasant. It's such a popular trope these days, with many many stupid examples of this same thing.
But if there are two people who have mutual attraction, then some skinship or cute seduction isn't anything terrible, it's just normal. Something like Karakai Jouzu no Takagi-san is more sensible than most of the trash I mentioned earlier, but that's not exactly the way those things usually go.
We've known from the start here that Tsukushi and Hinoka are not only super duper childhood friends, but also in love with each other. So if anything, reader will think it is high time they start going out. There is no way any other person could get between them anyway, Hinoka's mom and her memories contextualized that. So you can enjoy the ride of Hinoka being good at seduction almost naturally without any big game plan, at least so far.