Looking for a manga

MC is a fundashu who got isekaied +transmigrated) into a world of "Four Guardians", "Four Gods", and "Four Auspicious Beasts". They are the Azure Dragon of the East, the Vermilion Bird of the South, the White Tiger of the West, and the Black Tortoise (also called "Black Warrior") of the North. The world has no female characters. The beast gods has a chosen human called upon for them to consumate so that they take their full godly form. (They get married too)

The MC is called by the Azure snake, they fuck and snake becomes dragon. Afterwords they have a kid too.

I'm sorry I just remember the details of the story and not the story name ಥ_ಥ


Thank you in advance for reminding of the name of this manga ( ˘ ³˘)