A substitute teacher in the Bronx faces some serious criminal charges for administering some playground justice on one of his pupils.

Chukwuma Duru allegedly twisted the nipples of a 16-year-old student on two separate occasions.

Police arrested him on charges of forcible touching, harassment and endangering the welfare of a child. He was also suspended from his teaching position upon his arrest.

His sister, Amarachi, told the New York Daily News that she was shocked at the accusations and that she “started crying” when she heard about it on the news. She also called the alleged behavior uncharacteristic of her brother who, according to a recent background check, has no prior charges of misconduct.

Coincidentally, this is not the first time the same campus has faced charges of a teacher assaulting a student. And no, it wasn’t for administering a “wet willy.”