Groping Japanese Man

Date: 7/10/2016

I was in Japan on exchange staying with this young couple and the wife's husband kept groping me from behind while we were in their house. I was in a room with both of them as we were all listening to this other Japanese person talk, he was showing us something when I felt someone pinching my butt REALLY HARD and i jumped and turned to see my Japanese host mums husband next to me with a huge grin on his face and he wasn't shy about it at all. I gave him an angry look and just ignored what he had just done because I tried to not believe he just touched me. I turned back to the person who was talking, trying to listen. The wife was standing right next to me when her husband pinched my butt again very hard and I jumped away from him trying to make it really obvious but no one seemed to notice. I had enough and looked daggers at the Japanese groper, he chuckled loudly enough that I was shocked no one could hear him except me. With a huge grin plastered into his face he said something in Japanese, probably something dirty before saying "ahahaha sex-u-al? Ah? HahahA" I quickly made sure he knew I wasn't happy by frowning at him and flipping him my middle finger without the others noticing as I pushed past him. He vaguely made an "ooooo" and I was out of the room. I needed to get out of there. Somehow I found a random girl I knew in one of the spare rooms of their house and I told her what just happened and she hugged me but didn't show any protection or sympathy towards me as I was quite scared saying "I can't be alone in a room with him, I cant." I heard a bang that evidently woke me up and I was shaking. Literally.