My curvy sister gets stuck and I come to her rescue with sex

I was at home, chilling with my girlfriend when my curvy sister unexpectedly knocked on the door. She was in a tight spot and needed help, so I hopped in to lend a hand. Little did I know, my sister had a wild side that I'd never seen before. She was craving some action and wasted no time in dropping to her knees in front of me. I was taken aback by her bold moves, but I couldn't resist the allure of her ample assets. We got down and dirty right then and there, indulging in a steamy session of pleasure. My girlfriend joined in, turning our ordinary day into a wild fantasy. The sight of her riding my sister's luscious curves was a sight to behold. It was a tantalizing display of passion and desire that left us all breathless. It was a homemade sex escapade that I'll cherish forever, thanks to my adventurous sister and my amazing girlfriend.