Theory: Mari got tired of her suffocating daily life so when she woke up in Isao's body, she felt extreme freedom so she doesnt wanna go back into her original body anymore. That would explain why Isao ignored Mari (true Isao inside) even though it was implied that Isao have a stalker-ish crush...
Idk why the MC keeps on agreeing on this "provisional" girlfriend bullcrap. If you really don't want to be with her you can talk it in a serious matter and she'll probably just give up on this whole farce. She knows you like someone else and that's probably a good enough reason to just stay the...
Did she really rape him? He said that his clothes are not messed up so maybe she just masturbated in front of him to erase the aphrodisiac effect and didnt want him to record her doing. Idk