>>281801818
Female friendship is based purely around advancing access to reproductive opportunities and safety, by using those friendships to get closer to high value males. Matsuri's dad is one of the highest value males in the whole CITY, but is already taken by a higher status female. His son is therefore likely to be one of the most eligible bachelors in his age group, with enormous potential as a mate, protector, and provider. As a middle school girl, Ecchan doesn't know how to actually acquire such a mate, so she resorts to teasing and hanging around as much as possible, using Matsuri as an excuse. But in her head, she imagined that in a few years, she would marry him and have lots of babies with him, that it was an inevitable consequence of her being around him so much, and he would surely notice her and fall in love with her through mere exposure.