My gf's mom trying to seduce me?

My gf's mom is staying with us for a week and we all were drinking last night and my girlfriend passed out while we had some more drinks and she just suddenly sat in my lap and grabbed my dick and asked me to have sex with her and I am like wtf I told her to get off me. but she was too drunk to comprehend what was happening and she passed on my lap. What I don't get it is that she didn't particularly liked me so is she being a stupid bitch and should I make my girlfriend aware of it?
My gf's mom trying to seduce me?
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