She bettahhh WHOOP DAT ASS!!!
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Prepare the hate club...
OH IM JOINING THE CLUB
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Though I think Haruki might have told her that he initiated the relationship. At this point he has nothing to lose. He may have just not wanted to hurt his step mother by telling her that her son raped him. Again, I'm not 100% sure he tells her it's his fault, but I think he does. Either way she ends up blaming him.
The mother better whoop his son's ass and get him back to his mother fucking sense. I'M GONNA MAKE A HATE CLUB JUST FOR THE MOTHER IF SHE TRIES TO COVER IT UP OR TWIST IT INTO MAKING THE OLDER BRO SEEM LIKE THE CULPRIT