first masturbation to MIL

The second time I was at my future wife's house I already knew I was hot for her mother,my future mother in law Mary.I was 21 and she early forties. She was about. 5-1 ,short dark hair and busty.I went up to her bedroomand opened her dressing table draws.in one draw were her panties,all either black or white,next draw were her bras again all black or white and now I knew her bra size,either 36 d or e. In the third draw was an assortment of slips, panty girdles and nighties. I took out one of her panty girdles,lowered my pants and masturbated. I came very quickly and into a polystyrene cup and then drank my cum,closed everything and went back downstairs and sat opposite her at the table.