Embarrassing aunt comes to say hello

When Donk had been 7 years old a family argument had split his family in half. His mothers sister Gwen had moved away in disgrace and he had been told he wasn't to speak about her again. Being so young he was never told why the split had happened, he had never understood it as his family had been so close for years. However today was the day he would find out.

His aunt Gwen entered the store without a care in the world, she an older donkey and had aged like a fine wine due to her insistence on a healthy lifestyle. Her daily squats left her rear end looking rather plump and her chest was naturally big which lead to a fine figure for any young man to ogled at. She had come to the store to collect an item she had ordered, a lacy pair of black underwear. She enjoyed her decency but she wasn't shy about her clothing. If she wanted to buy underwear she would buy it, no matter who was staring. Very much unlike her nephew.

Without a care in the world she walked up to the stall, looking around for the young woman who ran the place but she saw no one. With a sigh she decided to try on an outfit, if she had to wait around she may as well be productive. She pulled a pair of black yoga pants off the peg and walked over to the changing room. With only a curtain there was no way to know it was occupied until it was too late...

Donk froze as he heard the curtain being yanked back followed by a female gasp. He had been looking down, past his little manhood and towards his new undies. White fabric with light blue stitching, sat just half way up his knees. To his luck he had been facing away from the curtains but whoever was behind him would get an eye full of not only his round fat donkey ass but also his new underwear! He let out a small "yelp!" before pulling up his underwear quickly, turning to face his invader with both hands cupped over his crotch. His heart dropped when he saw her.  
 "A-aunt Gwen?!" he couldn't stop himself from stuttering out in shock. The woman had too frozen, in part from shock and in part like she was trying to work something out... And his words had helped her find out.  
 "Oh Dominic! I thought I knew who it was... Your all grown up" she said with a smile, seemingly ignoring the fact he was stood in such an exposed state as his cheeks grew red. he couldn't answer her, he was frozen with humiliation. But then it got worse when he heard a door open and noticed the curtain was still wide open! Exposing his childish underwear to anyone who may enter!