Those scenarios I have in my head
Scenario #1: A young man becomes the embodiment of a an ancient fertility god/is possessed by an old fertility god.
As a result, he makes plants grow everywhere around him, everybody near him gets pregnant, he has fertile feets (yes, I’m a Pratchett reader), etc...
But, more importantly, he becomes chubby, gaining fat and nice curves, to reflect his position as a fertility spirit.
(It can also work with a wealth god/spirit. Often, fertility and wealth were treated by the same beings)
(And I also made a wordplay recently, about how, since fertility gods were curvy, being fat is having a god-like body, in a way. I’m quite proud of this one.)