I was made to assist my gal sister who started butt training. Initially, I had no interest at all, but as her ass got bigger and bigger, I started to get excited. Her plump ass sticking out during the workout captivated me, and I couldn't hold back any longer—thrusting in from behind. My sister was shocked and resisted, but her asshole began to twitch, showing she was starting to feel it. Her black, taut ass like that of a foreigner made me incredibly excited, and I repeatedly rammed into her and ejaculated multiple times!
