Fit An Entire Fist

My mother bit her pink lips when she heard that she had to spread her anus in front of her son, and she looked really reluctant to do it. But seeing that there was no other way out, she chose to ignore the deep embarrassment she was feeling, which was warming up her body, and chose to do what I said.

"L-Like this, Kafi?...Is this enough?" I heard her timid voice come from below and saw both her hands grab onto the meat that was right next to her  opening and pull apart her asscheeks like she was trying to show me how meaty her ass was.

This also made her anus, which looked like a purple black hole that would consume anything that went near it, expand and elongate to the point that the centermost point of her anus, which was her hole's opening, spread apart into a small line.