Started Out With Rubbing Her Feet

My mom worked a job on her feet all day, would come home and just want to soak them for a while then take a shower. I started rubbing them one day and she just loved it, asked me where I learned how to do that because I was only like ten at the time. I had not learned it anywhere and she already knew that, guess massage just came natural to me because I think she truly was enjoying it. She would get home, take her shoes off, she almost always wore nylons and would prop her feet up in the recliner and ask me to rub them. PLEASE!
On more times than one I would see the crotch of the nylons right up her skirt, she would just be laying there with her eyes closed letting out little sounds of joy as I rubbed away. Months turned into years, I had progressed by adding massaging her calves, she enjoyed it so much she often took a shower first then came out wearing her robe and if she washed her hair had a towel around it, no nylons on and I was massaging her bare skin. The robe did not afford the same view as the skirts and nylons but I was still enjoying her feet a lot.
So as luck would have it she came home and asked if I could massage her back, just was sore that day, told her sure and she had on a t-shirt and her underwear which were full coverage. When I was done with her feet she said something about being puddy in my hands as I worked up her legs then did her lower back. Once I started rubbing it I kept sliding into the top of her underwear so I slowly kept working it downward until her butt crack was showing, was pushing my palms into the those little round areas on either side of the tail bone and all I heard were sighs of relief from her. I was starting to include pretty much her upper buttock area and no complaints at all from her, underwear was down so far there was probably three inches of her crack showing when I heard her say just pull them down more and keep doing what you are doing, feels amazing.
With that I pulled them down to her the edge of her ass cheeks meeting thighs, rubbing them so good they would spread and I was looking at her anus and lower vagina lips and hearing nothing but praise from her. I kept going back up to her lower back though and even went up to her shoulder blades just to make it seem like I was not perving on her.
Several days in a row for the back rubs including her buttock areas, one day she just pulled her underwear right down telling me her upper legs were not the problem it was her lower back and butt that hurt. Her words so I started rubbing her feet as usual but after a few minutes she asked me to please do her back.
She was pretty much face down on her bed so not even looking my way, I was rubbing and bringing my face inches from her ass cheeks looking at as much of her pussy as I could without raising her eyebrows as to what I was doing. What I was not paying attention to was my erection and what I was wearing that day did not keep it restrained that good. I slid up to her thighs and was leaning over rubbing her back when she moved her ass back and forth and said Feels like someone is a bit excited down there. I told her sorry and she told me that it was okay, your are a guy so if it wasn't happening I would be worried about it.
So the massaging went on for a few more years, once in a while she still had a back issue pop up and would want it done but my foot fetish continued for a while longer.