Step-Mom Knows Best?

My step-mom has been drinking pretty heavily lately, she's a total train wreck. I don't understand what's gotten in to her. She's always buzzed acting all retarded starting fights with step-dad. The other night things got awkward when, after I seen step-dad and her fighting she came in my room to say sorry...well she ended up passing out on my lap with her hand on my dick. I know her and step-dad haven't been doing it much or at all, but I'm starting to think step-mom wants to fuck me.