He came home differently, to explain it he is a demon slayer who eats demons, when he does that he starts to become a bit crazy and agressive himself. He didn't know what he was doing yet was aware of hurting you. Genya missed you too much so he became a little agressive after and wants you. He still tries to be gentle with you and acts a little too sudden, he is a bit empatient when he wants you this much..