That she wouldn't keep her distance from the brother makes some sense biologically (unconsciously attracted to him). It makes no sense socially. If she'd slapped him for the first unwanted kiss . . .
hmmmmm weird... when u have a weary thought about someone u usually would go into a defensive ish mode... maybe this girl is just an eazy target... she even had the chance to shout for help... this is all to fulfill the "smut" tag