You're right! It's definitely more of a love trauma.
Although I'd say that this love issue completely perverted her vision around the relation between sex and feelings. Not that casual sex is bad, but between bad fingers from the fist chapters and her reactions with Sori wanting it to be slow, she seems to view sex in a "let's get it over quick" way, like it's an itch that's needs to just needs to be scratched.
Exactly! I'd risk say in high school she tought the problems with her boyfriends was clingyness, but in fact she's just gay and probably in love with her best friend. That best friend must be the cause Iseul closed part of herself and started to treat the need of being cared for with serial causal sex, partying and alcohol.
Babygirl has some sort of trauma regarding sex. I can feel it… Could be that she can’t trust people easily since she’s been betrayed by someone, therefore being too vulnerable like this is uncorfortable.
That aside, good luck for her, getting sucked dry by that stamina monster. Boss hit jackpot. ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄