Beta (слэш)

Clint’s spent years training himself out of the century-old instinct all betas have to obey alphas, and hiding how good a shot he is – after all, no one expects a beta to excel at anything. All that changes when he attracts the attention of Nick Fury, who recruits him into SHIELD. Then he meets Phil Coulson, and everything gets even more out of control.
(or: the omega fic where no one is an omega)