Sometimes touching it by step mom makes it hard and fully erect, which looked cute to both of us, she even massaged my pussy a few times, just to check how normal I am in that area, but like I said we never thought of it as sex till that time(?)
My step mom would regularly change her clothes in front of me, walk naked when I am the only one around; I would too, as it makes me feel free to walk naked in front of someone else even if it was my step mother.