Anal training for an older woman

My wife's friend who is married and is quite small cute size 8/10 and always kisses me when we meet ,she is 62 and has a son who is gay and lives with his partner in London my friend who let's call her Babs one day texted me asking if we could chat!! I met her in a small cafe near my home and she said her husband would have nothing to do with the son because he was gay and she was asking my thoughts on it all as a straight man.
Well I soon assured her that I had never had sex with a man but understood the attraction of that sort of sex and I had occasionally used things myself to stimulate the prostrate, Babs was now getting inquisitive about anal and I said I would help her but not have sex with her because we are both married, she agreed and I went to the local sex store and bought her an anal training kit. Basically it is 3 rubber dildoes size starts about my big finger final one is about the size of an average dick, luckily she had the house to herself for the day hubby had gone to an away football game, so I shot up to her house with the kit and a bottle of KY lube, I promised her that it wouldn't hurt and I would stop when she asked, after taking her pantys off I bent her over lubed the finger sized dildo bent her over the end of the bed and placed the dildo in her entrance then slowly pushed more into her are she never murmured and I said this is what anal sex is like she told me to carry on after a few minutes she told me that was the first time anything had been up her arsehole and could she try the next one. As I slowly pulled it out of her I could she it was smeared in brown shit, I got it out looked at it and pushed it into my mouth, she looked around and saw what I was doing and said oh no in disgust, I appologised but said that is what her son would be doing to his boyfriends cock! After we chatted I proceeded to use the next size dildo which started to make her moan and started to fuck her arse with it she said it felt good and wanted me to use my cock on her. I withdrew the second sized dildo once again covered it her shit which I licked off,then she said she wanted the toilet so I said OK can I watch she said no I need a shit I said great I will lay on the floor and you shit on me!!! She didn't like it but said OK if I cleaned it up, well she squared over me and I quickly got my mouth as near to her arsehole as possible and she let go into my mouth not a lot but enough to fill my mouth she stood up and watched as I swallowed it all and thanked her with a kiss, she said she didn't like that but I said its called scat and lots do it maybe even her son!
Back in the bedroom I applied lots of lube to my cock because l knew it would stretch her,pushing into her virgin arse was unbelievable the tightness she was screaming it hurts stop and I did but then pushed again and now the fattest part of my vock was in her she was whimpering but said carry on well I didn't get it all in before I came my load in her bum, wow what an orgasm as I withdrew I asked Babs to suck it she shook her as if to say no but I said please, and once again this was a first for her. Some shit was on the side of my cock and as she sucked it stuck to her upper lip, I couldn't resist so I dragged her up to me and kissed the shit off her and pushed my tongue into her mouth she gipped at that but took it in.well that was the start of many a session on away match days and now Babs can nearly take a ,10 inch dildo all the way and she loves anal I love her shit and we never have vaginal sex, thank fuck for gays.