Fallen in the Moonlight

Anu is the last omega in the whole world, he lives with a alpha named Keru, who he calls the golden retriever because he acts much like a kid when they're both in collage, one day he meets Kerus friends and falls in love with one of them, Zene.
One day Zene finds out he's an omega because he went into heat and had no more pills left to take so the only way out was to get fucked and he chose to get fucked by Zene.