Daddy watches me oil my grandmother's ass before fucking her in the bathroom

I was in my grandmother's bathroom, getting ready to clean up when I noticed my dad's reflection in the mirror, watching me as I oiled up her ass. It was a strange feeling, but I couldn't help but get a little excited by the thought of my dad fucking my grandma. I decided to play along and pretend like I wasn't aware of what was happening. I continued to oil up her ass, making sure to cover every inch of it. My dad was right behind me, his breath hot against my ear as he whispered dirty things to me. I could feel his excitement building up as I continued to oil up my grandma's ass. Finally, he couldn't resist anymore and he took her from me, fucking her hard and deep in the bathroom. It was a sight to behold, my grandma moaning in pleasure as my dad pounded her ass.