I think he tried to grope her, but that could be wrong. We see her patting her chest, maybe he tried to slip a hand in her pajamas... It's up to imagination a this point.
He probably did someting close to sexual harassment, but they are pretty close so this line is a bit blurry...
That's the point of their interactions at this point, to suggest something indecent and wrong happened, while we see nothing of the sort so that we guess nothing harmful happened and don't start considering that this story is trash, but instead cute and innocent.
That's my opinion