Just a good old college AU, where nothing is wrong, and The Wizard is just a politician
Imagine Glinda accidentally traveling back in time for one reason or another and running into Elphaba in the woods.
She tries to skirt around who she is at first, before spilling the beans at Elphaba's unimpressed face. So now Elphaba's trying to help her get back to her time, with the added benefit of now having to hide a whole grown-ass adult.
She's also trying not to let her curiosity get the best of her because last she checked, Galinda and she were still pretty deep in their loathing era so why is Glinda being so nice to her?
Meanwhile, Glinda is just charmed by college student Elphaba. Had she always been so serious? And where had her glasses gone?
The first problem comes when night falls and they both realize Glinda has nowhere to stay. Elphaba suggests starting a makeshift camp before quickly offering up her dorm room upon seeing the unease on Glinda's face.
It should be fine, Galinda was going to be out with her friends anyway so she won't be back until sometime tomorrow.
The next problem is sneaking her into the room. No one pays Elphaba any mind, but the stranger next to her hidden within her borrowed coat certainly draws attention.
Another problem arises when they get to the dorm and Glinda insists she share Elphaba's bed.
"It isn't proper for me to sleep in her bed when she's unaware Elphie,"
So now they're bunking it on the same small bed and entirely too close for Elphaba's comfort, but it's fine, it's fine. It's just for tonight, hopefully, and then everything will alright in the morning.
Except, the morning starts with Galinda bursting into the dorm room like hell-on-wheels, startling the cuddling occupants on Elphaba's bed into alertness.
The silence and ensuing staredown are only broken when Galinda releases an angry yell, and the two are left scrambling for their things as they are basically thrown out of the dorm by the younger Upland
It seems that rumors had gotten back to Galinda that Elphaba snuck in her older, hot girlfriend and she stayed the night
Everyone is blind to the fact that Galinda and Glinda are literally the same person, they're just face blind except for Elphaba