I think my stepmom has an attraction to me ?

My dad cheats on her and one day we started talking and she asked somethin about my father, like what did i think of him and stuff, I told her that my father did the same shit to my mom and thing that happened beetwen my mom and dad. since then we became good friends and one day, one of our conversations end up in sexuality, she told me like when she was young she used to have sex with a girl who was her neighbour, that one time she found some zoophilia porn video tapes in her ex-boyfriend's drawer and more stories. I'm 29 yo boy who loves older bbw women, my stepmom is a 50's year old bbw with 38GG tits(perfect), so I told her I had sex with women of the same age of her's and some of my stories too so we ended having open minded talks. Then sometimes I walk around in underwear and when I talk to her sometimes I notice her eyes on my crotch, everytime she has to bend over, she just turns her ass to my direction, then she walks around in her sleeping dress without bra and i cant take my eyes of tits and nipples. This goes on for like a year but none of us have ever made the first move, so I don't know if its really a good relationship with flirting, if she's avoiding because of the situation (fuckin her husband's son) or may be afraid of my reaction(ofc its going to be a good reaction).