Bottom

You decide that right now, you can't bear for your top half to be any sluttier. Plus, if you replace your shorts, you don't need to waste any money replacing your top too, since the used condom is attached to your shorts.

So in the end, you approach the shop counter, still red in the face, holding a pair of even tinier shorts, and trying to stand in a way that avoids the young man at the counter seeing your used condom. You reason that you should be able to buy a new thong, too - wearing shorts this tiny, even with underwear underneath, is still notably more slutty than wearing the somewhat less ridiculous shorts.

The man silently rings up your transaction, while giving you a very curious stare.

"Um, is there anywhere I can change into this?" You ask.

"We don't have a changing room any more, too much shoplifting and... ahem other stuff was happening in there. But we do have a room in the back."

"Oh, thank you." You say politely.

"I didn't say you could use it yet. How about this... I'll let you use it if I can take a photo of your butt in your new shorts."

You shudder, but to be honest, it still beats having to go back out into the streets, and loads more people seeing your used condom.

"Fine." You say, allowing the **** to be clearly audible in your voice.

And so that's how you end up wearing even tinier, sluttier shorts than you arrived in Viridian City with, and allowing some random pervy shopkeeper to add a photo of your butt to his wank fodder.

To add salt in the wound, after you've changed he makes you pose with a 'peace sign', like a real slut. Rather than protest, you just want to get out of there quickly and safely, so you do what he asks without complaint.