I took the initiative to find my younger brother and wanted to make out with him, but I didn't expect that he also wanted to play SM....

I took the initiative to find my younger brother and wanted to make out with him, but I didn't expect that he also wanted to play SM. He made me beg him to fuck me, and whipped me with his belt, and asked me to masturbate for him to see. I had no choice but to satisfy him. Who made me reach the age of being as fierce as a wolf?