Step Daughter

My Partners daughter lives with us and she is so beautiful and sexy with amazing breasts. She is 32 and I have been fantasising about her for a long time. I've started masterbating with her panties which I think she knows but as said nothing. She leaves them in bathroom and they are always on top of washing. She always wears tops with most of her breasts on show too. I don't have sex because her mother is not well anymore. I would love to strip her naked and make love with her.