Acting like one turning into one whatever. It's not so much the sexual context of the word moreso the I deserve to be rewarded for being "kind" and being irrationally angry when things don't go your way. Buzzword or not the way he's acting is anything but mature.
I feel people are way too used stories where the other parties are actually malicious. All I'm getting from this is people here are either sociopaths or lack reading comprehension.
There's no isekai. It's just being super meta. Shiho is not affected because she's the "main heroine" and has seemingly supernatural powers like with Ryomas brainwashing.