The Devil, the Beauty, and the Beast (short story)

Ever since their teenage years, there's been something between Prapai and Phayu. They've spent their first ruts together and every single one since, they've trusted each other through everything on their way to adulthood. They know each other, body and mind, better than anyone ever could.

As they grow up, their interests develop into different directions, though.

Phayu needs voluntary devotion, wilful indulgence. The deep, gratifying absolution of a heart wholly and freely given. At least from one person, from his person. Prapai wants someone he can spoil rotten, someone who loves the easy way in life, who puts up with his spontaneous plans and whims, with his flirting and his playfulness.

When Phayu meets Rain, it becomes increasingly obvious that this Omega might just be the one crucial link to bring them all together.

This is another story that I liked on Ao3
Author on Ao3: ivor_outlaw