36F Got felt up and fucked by an old man while visiting a relative

Was visiting a relative at a senior living facility while my husband watched the kids at home and upon leaving was accosted by an old man, felt like from his tats and overall appearance was a biker once, I wasn’t attracted to him but he was apparently to me and either off his meds or well past giving a fuck gave up on introducing himself and went straight into feeling me up, this went on longer than I expected and before I knew it his cock was out and I was straddling it, I felt oddly drunk from adrenaline at this point but just did as he said and before I knew it it was over and I was back in my car hyperventilating. I haven’t told my husband and don’t intend to. Idk what came over me or why I enjoyed it so much, I’m used to men on occasion staring at me but not full on grabbing like that.