Bio Shock

Extended A/B/O Universe/ Classification AU:

The only things guaranteed in life are death, taxes, and classification.

Once 18, they get tested.

Split between Dominants ( Alpha, Dominant, Beta), Neutrals ( Neutral, Caretaker, Switch), and Submissives ( Submissives, Omegas, and Littles) - each one their own subspecies of humanity.

Each has its own laws and expectations.

Or:

Dick switches doctors and finds out his original classification results are wrong, diagnosed with LCS- Latent Classification Syndrome. Now Dicks is in a race against time to get healthy as his body shuts down, trying to right itself.

Having to learn to be vulnerable and what he's never allowed himself to be - Little