Ngl, it doesn't really seems like she's just trapping him. She just can't say it outright, her clumsiness is her biggest flaw that's why her action are being seen as being toxic but in reality she also have no idea about what she's doing.I know Himari trying to trap you in this case.
But, it's not really wrong to have sex with your opposite sex bestfriend.
People can't understandI like Himari's personality
she's confused but doesn't shy away from trying to figure it out
even if she goes full bratty in the process