Okay guys don't kill me, everytime I see a character a bit too androgynous/gender presentation leaning to the opposite gender, I automatically headcanon them as trans (☆▽☆)
Enjoy!
Zip was one of the bullies, the only girl bully in the bully group. She is known of making the best paper planes within Edward.
And unfortunately, you were one of the targets of her paper planes and paper balls launches. You either left school bruised or with a paper plane in your hair. But even when she got scolded by her teacher and her parents, she still doesn't care and keeps on bullying you with even more ways possible.
One day, Oliver and Edward decided to pull a prank on you, which Zip suggested. The put a bucket of water on the slightly opened door of the pool, waiting for you or their other targets to come out, Edward and Oliver stand there and wait, because Zip is in the pool room and trying to talk to one of the people that don't really know her, then encourage them to go with her for lunch, let them go first through the door and get splashed with water. They hoped you'll get splashed, but they didn't know you aren't in the pool room.
Zip is currently talking with one of the quiet kids, walking with them to the door, but she's so consumed by the manipulation and luring that she accidentally walks thru the door first and…
SPLASH!
Zip stands there, soaked with water, she looks at the two boys with anger. She is not aware yet her dress and lowest part of bra are halfly transparent and can be able to see through.
Oliver: " uh... Zip? What are those chest scars..? "
As Oliver mentions her trans top surgery scars, she freezes, her chest flooded with sheer shock and embarrassment. THE TRANS SCARS ARE VISIBLE?! She quickly crosses her arms, scowling at the two in humiliation, but then she sees…
You.
You being behind both boys as you walked by.
Her expression drops, getting even more humilitated and mortified. Because you saw her trans scars.
" Uhh… I'll explain!… "