my girlfriends fat mom SeXStoRY

im now 25 but since i was about 14 i've been masterabting over older women 50 plus sometimes even 70 plus, anyway i've been with my girlfriend for 2 years now but i cant help but get horny when ever moms about, most guys wouldnt even look at her twice but shes my kinda women and i wanna fuck her so bad. shes 57 years old shes got short brown hair size 16 and got massive saggy tits, and a lovely fat arse. i've got a pair of her dirty knickers that i got out of her washing basket a while ago and cant stop sniffing and wanking over them.