As if a cute girl of his age could ever compare to you Karen.
Pretty sure she set out because she actually wanted to ensure if she is finally free. Runs into his fetish and trolls him similar to Chapter 1. That a win right there for everyone involved; Haru who now knows how Karen laughs, Karen who finally can hold her embarrassment to get back at Haru and us the readers. The only exception are the bystanders who returned to their 2D waifus(can't really blame them).
Consider the fact he's a teenage boy who isn't allowed access to lewds. Imagine how pent up he is. Now allow him to redirect that energy into bullying you so he can date you.
Ah porn. As eternal as cognitive thinking. It will exist at any give time, place, or universe for any given species, sex, or sexual orientation. It. Is. Inevitable