My dad was a trucker, so he was gone most of the time. After my older brother entered the military it was just me and mom most of the time. At one point she decided she had to get in better shape, so she started to do sit-ups. However, she had a habit of putting on her nightie after dinner. It was sheer enough that I could actually see her nipples through her top.

She would ask me to help her with her sit-ups. She would have me sit on her feet and hold her calves while she exercised. Each time she came up I would get a glance at her tits and often felt myself start to get an erection. Sometimes her nightie would ride up her thighs, and she often wore no underwear. I'm sure she saw me staring at her cunt on occasion. I could even smell her pussy juice and it got me even harder. When she strained I could feel her toes curl up under my ass as she pulled up on her feet as she sat A couple of times her toes were up by my nuts and it was like she was masturbating me with her feet. She actually made me cum a couple of times. I'm sure she noticed, but she never said anything. We never fucked or anything, but after sit-ups every night I had to go into the bathroom and jerk off. I'm in my 50's now and still get a boner every time I think of her nipples poking out at me.