The lot of you can relax; there's no power dynamic here. It's two girls of the same age in love exploring their first time, and there was a clear line establishing boundaries in case the "lesser-experienced" one didn't like what was happening. Consent is frequently requested and there isn't any deceit involved in the act. Ironically, this one-shot involving a character initially unacquainted with the concept of sexual activity has a healthier portrayal of lovemaking than almost all erotic material I've seen out of manga in general.
If you think this is manipulative or creepy, you might want to consider why you associate sex with being inherently harmful on a base level and probably brush up on how abuse actually plays out.
I never made any claims that sexual activity is harmful, nor did I say that Misaki is a pedophile herself: just that the way she went about this could be really close to how one would act with their victim, by using sweet words to manipulate the victim into touching without knowing what's really happening.
People who defend this story so aggressively seem to assume that Kokoro knows they're having sex, while the its pretty clear she doesn't know. Her partner is fully aware and keeps talking about it in roundabout way which makes its looks so manipulative. First times are awkward but I would hope in most cases people are at least aware they're having their first time, something Kokoro doesn't seem to realize.