I moved my hands over the base of the back of of mom's thighs, above the knee and slid them slowly up, squeezing firmly as I did so. As she seemed to want me to do the tops of her thighs, I slid my hands further up like before, under the fold of her skirt, and let my fingers feel the lower part of her butt cheeks through the fabric when I got to the edge of her panties. When I squeezed the flesh of her butt cheeks where my fingers touched them through the panty fabric, I realised what an ample and large ass she must have.
I carried on like this rubbing up and down for the next few minutes or so, being careful not to go too high over her ass, but stopped, as before, when I felt the material of her panties.
Occasionally mom would utter some appreciative word, I noticed mostly when my hand reached the lower part of her ass cheeks, which I was enjoying getting the feeling of immensely. I started to feel more confident and wondered if I should dare going up further over the whole of her butt cheeks and feeling each ass cheek fully.
I was feeling quite turned on at this stage and feeling like I needed to cum again. I realised we'd probably be stopping soon, so decided to try my luck as we got to near the end of the massage.
I began just above the back of her knees again, and slowly started moving up, gently squeezing and rubbing the flesh of the back of her thighs. I slipped my hand under mom's skirt and moved upwards. Any moment, I would reach the panty line. As I felt it, rather than pull my hands back down, I let them wander up over the panty fabric and over the full mounds of her ass cheeks, one in each hand.
The feeling was ecstatic and I squeezed down hard enough to grab a full handfull of thick, juicy flesh in each palm. I didn't circle my hands around, so as not to seem too obvious, and then quickly moved both hands down again to the thighs.
"Ooh, that's nice" said mom before my hands completely left her ass cheeks.
I swallowed, not sure what to make of the compliment, but said in a rather timid tone "I'm glad your enjoying the massage mom."
"Thanks son" she said, "I think that's enough for today."
to be continued....