Our Friend Tina

My wife Sharon and I are in our early fifties.  Our friend Tina is in her late sixties.  She is a very prudish shy christian woman.  The whole time I have known her I have never heard her swear more than an occasional damn or hell.  She is very outspoken about homosexuals and gay marriage.      Tina fell on hard times so we decided to let her stay with us for awhile.  I have always loved her as a friend but never found myself sexually attracted to her.  She is very heavy with big saggy tits and a huge ass, which I never found attractive. After she started staying with us she would wear short tight nighties and underwear that were 2 sizes too small so they were extremely tight on her.  Her short nighties were always resulting in accidental flashes of her underwear but i would always look away. One night she fell asleep in her chair and her nightie was pulled up more than usual showing her panties off in full.  I happened to glance over and saw that she had a massive bush bulge in her panties, which being so tight pretty much left very liittle to the imagination.   I found myself getting aroused and couldnt take my eyes off of that huge bush.  I found that i was hard as a rock but kept staring at it until she finally  stirred so I looked away at the tv.  I excued myself to the bedroom and jerked off three times in a row.  I couldnt believe I was actuallly jerking to Tina. From that moment on Tina went from frumpy to sexy as hell in my eyes.  Those huge saggy tits suddenly turned me on and her huge ass was suddenly hot.  Her short nightie would sometimes pull up when she is walking away showing her pantie clad ass.  Now I was always looking for it, those extremely tight panties riding her ass crack and showing off those full hot sexy fat ass cheeks. What prompted me to write  was something that happened the other night.  I had woken up in the middle of the night and went out to the kitchen to get a glass of water.  I heard a quiet moaning coming from the other room.  I stood behind the wall and looked to see Tina in her chair with her hand up her skirt in between her sweet fat thighs masturbating furiously.  I couldnt believe my eyes.  What totally blew me away was what she said next.  Shy prudish conservative christian tina was saying "eat my hairy cunt Sharon."  My knees almost buckled out from under me. I was stroking myself through my pajama bottoms not wanting to cum yet but it was very hard.  I totally lost it though when she took her hand out from under her skirt, put it to her nose, and gave a long hard sniff.  I came hard. Of course I havent said anything to her about it, but I feel like I know a secret about her.  And I cant be more turned on.