Mermaid's Egg

After a plane crash, the young master of a rich family found himself on a deserted island, then, he accidentally resurrected a merman! This merman is not just any other ordinary wild merman, he’s the high priest of the deserted Island tribe! The arrogant young master is not only trapped on this desert island, but also forcibly experiencing the “transformation ruse” and is forced to hatch an egg?! "Is this young master going to lose his face?!" This primitive tribe is so scary, I can only rely on the merman brother to save my life...

(Source: MangaDex)