Although a happily married middle aged woman, my husband doesn't give me much sex and I've been seeing one of his mates from our local pub, who is a real dirty old man in his 60s but has a big, hard cock and likes to fuck me now and again. On one occasion I was out with some girlfriends in the pub and after they left he joined me for a few drinks. He asked me what "little frilly panties did I have on my pussy" and suggested we have "some fun" back at his place. He said he wanted to put my knickers on and fuck me. Although this was very naughty and pervy it turned me on. I went back to his flat knowing he would fuck me. Despite him being a crude slob, the thought of having his big manly cock up my cunt was exciting me and my pussy was leaking into the gusset of my white panties. He started groping me under my skirt, his rough hands rubbing my slit through the crotch of my wet knickers. He undressed and his cock was sticking up, thick and stiff and leaking pre-cum. "You want my cock up your fucking hole don't you, you dirty slag" he growled and told me to take my clothes off. He told me to leave my white panties on "for a sixty nine" - he got me to sit on his face and suck and lick his cock while he sniffed and licked the gusset of my damp knickers. Soon his tongue was in my pussy and his stiff dick was throbbing in my mouth, dribbling with pre-cum. He then told me to take off my stained knickers and give them to him. He examined the gusset, heavily stained, and told me I was a dirty fucking bitch. He sniffed my panties and told me I was a fucking dirty slut and that he was going to fuck my pussy and fill my cunt with his spunk. "I'm going to wear your dirty knickers with the gusset on my balls and arse that was just on your cunt and bum" he laughed.He put my dirty knickers on and his stiff cock was sticking up above the waistband. He told me he could feel the damp stained gusset of my undies on his hairy balls and arse. He then pushed his big stiff cock up my pussy and started riding me. After a short while he said he was going to cum and started grunting as he shot his load up my hole. I could feel his semen jetting into me and running down his shaft onto the sheets. After he pulled out he took off my soiled panties and wiped his cock on the crotch. When I left his flat his spunk was dribbling out of my slit into the gusset of my already very stained white knickers. When I got home I had a quick shower and hid my soiled panties in the wash basket before getting into bed with my husband who was asleep.