I've been reading this shit since the first one got released in Japanese on MRM. It's been interesting watching the author's art improve as each story gets more and more depraved. I think the wacky tits are also a part of that one fetish where a mangaka would make a handsome or pretty women have someone crazy going on with their body (ie wacky tits, weird genitalia, hairiness, something else wild, you get the point). In this case it's a literal manifestation of what the father in law has been doing to Haruka.
Diana was probably a good person but has become lost in fear and greed. (Ie grew a massive ego) It's probably why she lost her powers to begin with. I don't think she meant what she said to Diana (At least the first part she said. She's still stupid af tho cause all it did was make her sound like a hypocrite) and was probably hoping she could just put Hess in a corner by saying some dumb shit like that. It's also very clear that Diana really does think that she's above her own actions, and that because Hestia isn't her that it's ok to point fingers.
That would also explain why she only invited people close to her. She wants them to act as her support and defend/agree with the shit she's spewing, along with the belief they'll follow along with whatever she says









I would like spoilers as to what's to come pls
As far as I know the MC will try to suicide jumping from the lighthouse, but the ML will save him.
Thank you kind soul