Our TG Caption

As you left the building, your cheeks still red in shame, you blushed even more, when both Brandon and Kevin eyed you first in interest, then in disbelief. Then both of them began to laugh.
"Okay, cool setup, lady, but how much you were paid for doing this for our pal?", Kevin asked you, much to your dismay. Great, this would be awkward to explain now.

Luckily you had at least some options here for what you could go. While you couldn't necessarily proof your identity, you could at least tell them things, only you knew about the two of them. At least Brandon you could definitly convince on that, given that there is something only the two of you knew about eachother.

On the other hand though,if they wanted to see the proof, it's likely that one of them or both would check on the bathroom. In any case you knew that both of them didn't necessarily deserve this. They can be sometimes mean from time to time, but you knew that this would screw over their life, just as it probably screwed over yours already.
Thus it would be a tough decision to make.