Entertaining a Shady God

The Shady god is bored and he wants entertainment so he will do what all other gods do. First he will choose someone then give him gifts. Then he will do the reincarnation drill after whicch he will lay back and his chosen ones antics.

But after a picky selection, he has come to a deal with our protagonist. But should the poor MC know of his restrictions and the gods childlike antics he would regret dealing with the god.

The journey of a smart, skilled, and possesive protagonist as an entertainer of the shady god