Is this rape?

My husband told me that when he was 12 his step sister came into his room and had him put his penis inside her. She was 17 at the time. They are not blood related in any way. She was his step dads daughter from another woman. Me and his best friend are trying to tell him that she raped him. He was 12 and had no idea what he was doing but he doesn’t think it was rape. Would you think this is rape?

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