Is it normal that i want to sleep with my mother in law?

I've know my mother in law for 3 years and in the last 2 months I've been sexually attracted to her. She's an average beautiful woman, with a fat butt, big boobs, and long dark black hair. It all started one day when I've caught her looking at my pulse through my skinny jeans. I didn't think anything of it at first, but as she started to see me more then I would notice where her eyes landed. I soon become more eye sexing her myself. She started bending over a lot more and having conversations about things more often with me. We look each other in the eyes and we both look away then look back at each other. We both get shortness of breath and act very nervous when it's just us alone. Recently I've seen her boobs when she bent down to pick up the baby. I would motor boat those coconuts. I want to tell her one day if I catch her stirring that I see you looking at my you know what, and is there something that your interested in. But then I again maybe I'm just overreacting and it's just my mind playing a dirty trick on me.