To make a long story short, I was at the stage where I was frequently massaging her feet, and long before that, I was licking them hidden under the table, but that's another, very long story.
Anyway, as described above, I was frequently massaging her feet while she watched her show and would end up falling asleep in front of it. She knew about my passion, though. Playing with fire, I ended up getting burned and masturbating on her divine, wrinkled soles, thinking she was still asleep. But no, she let me finish and ordered me to wipe up my mess, which scared the living daylights out of me.
When I apologized, instead of yelling at me, she told me she suspected it had never happened to me before, and that despite everything, I was a very good masseur. She added that if that was all it took to please me, and since I'd always been there to help her with daily tasks, as long as I remained respectful, there was a chance I could benefit from it again. That's the short version.