I've been single (no relationship) for a long time so I'm not sure, but does that hug count as 'love-bombing'? Maybe that's where the wild jump in logic comes from?
I can’t say for sure, but love bombing is when someone constantly shows affection and attention to their partner for a period of time, say, a week, and then suddenly stops, leaving their partner confused. I doubt that’s the case here. It seems more like Mitsuki's personality and how she does things in her relationship with Aya.