My niece, who came to visit the hometown, is in her growth spurt and her butt has rapidly grown into an adult-like shape, becoming my favorite big, round butt! As she slept, exhausted from playing, I couldn't help but stare at her defenseless pajamas and big butt. Unable to resist such a perfect butt, I reached out and touched it… But that wasn't enough; I pulled down her panties and inserted myself! The intense piston motion woke up my niece, who, despite protesting, was feeling immense pleasure! I couldn't help but ejaculate inside her, and then the excited niece attacked me in return!
