Touching one's mother after masturbating

I have a question with regards to hurmut mussaharah. Unfortunately, I was watching porn/masturbating one evening, where suddenly my mother entered the room. Although I did not expose myself in anyway, I was greeted and touched whilst I was still in an excited state from the haram I did. I remember feeling something inappropriate and trying my best to suppress the feeling, although I have no such feelings at all normally (sorry for going into detail, but I remember I still had an erection before they entered and there was a feeling after the touch which was out of my control). I also remember warmth from the touch. Has hurmut mussaharah taken place? Please advise me what to do.