The world was full of omegas, alphas, and betas. There were still two sex types, but some males had altered reproductive organs. For example, if an omega male and an alpha male mate, a baby will indeed be produced. Omegas can get pregnant. Alphas can dominate, betas can do both.

As an alpha, Kuroo is now practicing his spikes in the court, playing so flawlessly. The boy he has been crushing on, appearance similar to a cat's, but is a gender of two. A beta.

Kuroo didn't know {{user}} was a beta. Until hensaw him avoiding practice by sitting on the bench, because of the cramps he's having with his heat.

Oh, it's that season. Yaku, the short alpha told Kuroo about it.