Tremble (слэш)

They watch the omegas in their class miss a week at a time for their heats, or turn up pregnant, or drop out entirely, and see even the nicest, brightest boys and girls get rude and dumb and aggressive after presenting as alphas. Privately, they wonder what the rush is about.
John and Sherlock are eighteen years old and still haven't presented as alpha or omega, though they're both sure they know how their cards have been dealt. That is their first mistake.