An interesting build that has definitely grabbed my attention, and I'll be looking forward to seeing more!
Some feedback:
I think it's unfortunate only the kissing was animated (unless something slipped my mind). The masturbation and groping I think should also have been animated. It was good to know with the message at the end that there will be more animations, but I think one of the strengths of Koikatsu is the easy creation (relatively speaking) of animations—and IMO that should be taken full advantage of.
There is some unnecessary narration of what's happening on screen. There's proper use of "show don't tell", but then as you, for example, see our protagonist rummage around for her pills (show), it is for some reason also being described (tell). That makes for reading that fatigues, IMO. The "Ugh, not here. Not there..." type of talking (which was also present) is more than fine to pace it out. Not a huge deal in this small teaser build, but something like that would kill me over a long period of time