My Grandma the Artist

I'm not a great looker and a bit skinny in build but was asked to pose for my widowed grandma (60) wearing just a sheet. I (22) only agreed as it was my grandma doing the asking, but she wasn't happy with how I looked in the sheet she called a toga. So, she decided to go all ancient Greek, having me pose totally naked. But I wasn't comfortable being naked and so she got naked as well. which caused me to get a hard-on as she was the first woman, I ever saw naked. Being a very self-confident woman, she decided to get rid of my hard-on the easiest way. She fucked me twice and that satisfied my cock for a time, of course at each session it would arise again and get the same remedy. But after the painting was done, every time I visited my grandma I got aroused. She took care of the arousals most times not all. But I'm a very willing artist model for her now.