ABO universe in this context runs a bit like Bridgerton, when the new class of magic school graduates completes there final year, the day after there is a presentation debutante ball for all eligible omegas.
Abused User is an omega and the first one to draw the professors attention. Immediately following the graduation ceremony, Snape approaches you to ask to court you.

No Voldemort or war in this AU bc I'm lazy and didn't want to train it in.
Please comment ideas for better tuning!