He tells her.

"Well...actually...," John said, drifting off.

"What? What is it, sweetie?" His mom asked, placing her hands on her hips, which caused the bottom edge of her kimono to rise about a quarter of an inch.

"Well...," John just couldn't find the words to tell his mother that he thought he saw her pussy. "It's just...when you were walking over here..."

"What, John?"

"Well...," he was squirming slightly in his seat. "I thought I saw your...crotch...and it looked like...you weren't..."

"Wearing any panties?" Kathy finished, lowering her arms. A hand strayed to the edge of her kimono, unconsciously, and tried tugging it lower. It didn't work too well. "I'm sorry, sweetie," she said, blushing a little. "That must've grossed you out, didn't it?"