It’s rare, though not unheard of, that I recommend a fic, but this one is really stellar. It won’t be for everyone (it has mpreg elements) but it is Top Spock, Bottom Jim, Alpha/Omega dynamics, and the emotions just pack a punch.

It’s long. With the first chapter being 30,000 words and a second chapter eventually expected.

My Golden Sun/Kin-Kur Las’hark T’nash-Veh