Changing room exposure

Much to his shame Donk had never moved on from tighy whities. He had tried of course but the snuck feeling on his tiny package was something boxers could never provide. Though living at home he had gone as far to do his own laundry so his family never found out and now he lived in college he hoped to continue without anyone finding out. However not long after starting he noticed big holes and even rips in his favourite pairs! He had reluctantly gone to the mall near his collage but was shocked and shamed to find the only tighty whities they had were in the children's section and they were much too big for his little pecker to feel snug in! That was far from the only issue as when he had went to the mall to find some a group of girls from his class had spotted him and came over for a chat, embarrassing undies in hand! He had managed to bluff his way from humiliation by saying he was picking some up for his (fictional) younger brother but he knew that excuse could only work once.

That's why he had gone to a small time store on the edge of town. It specialised in custom made clothing so it would not be embarrassing to enter by itself and most importantly offered a changing room to try on stuff before taking it home. It had been embarrassing at first to talk to the woman who owned the shop, a young 20 year old giraffe he had never seen on campus named Jill but she had been so helpful once he explained what underwear he was looking for. She even promised to give him a discount as it would be using "so little material!"

When he went in to try on and hopefully pick up his new underwear it could not have come sooner. He had ripped his last pair at the seat so now they were more like tight assless panties then tighty whities! As he entered the store the door bell rung and he saw Jill on the counter.
"Hello Donk! Let me get your "little" order" she giggled. Donk had never told her about why he preferred tighty whities or his little secret but by her many, many comments he was sure she had guessed. Though Jill never went farer then soft teasing so he didn't mind it... in fact he had to admit his little willy often jumped at her words! Once she returned he looked into the brown paper back she had placed his order in to make sure no one saw what it was.
"Thanks Jill" he meekly said, he was starting to fancy her a little which only served to make him want to return even more!
"Hehe, no worries, head into the changing room, I'll make sure no one comes in on you"

With a nod he walked off to it. As it was a small store with only Jill running it the place only had one changing room. It was a small booth with a curtain that came down to just above the ankle, not ideal but better then nothing! The room wasn't even big enough for a mirror so one sat outside the changing booth. He got to work stripping down, playing his old underwear on a hook so they didn't drop into view of Jill or anyone outside and looked over his body. His little friend was sat at barely an inch and he blushed deeply at being naked near such a nice lady! As he bent down he faced away from the curtain and lifted his leg to pull up one of the new pairs of Tighty whities, he was exciting to see how they looked and felt! So much so he never heard Jill shout.
"Watch the curtain a minute! I'm off to the restroom, be right back!" If only he has...