Drawn by the incredible  flammars

Devils age about one year for every hundred that pass and tend to spend their first fifteen hundred years being tutored by their parent or mentor, then the next three thousand or so cultivating whatever powerful ambitions they harbor and attempting to bring them to fruition. That's the stage the Pana you know and love is at, exploring the world, learning, loving and setting people on fire.

Once they reach four thousand five hundred or so, they tend to get broody, male or female. Sure, they've fired off a few thousand litters of imps here and there, but once they start getting older, they start getting really focused on their legacy. Their bodies assist in this by refocusing their powerful magic away from their personal use and into developing the most fertile offspring possible. They tend to get bigger and heavier, the males bulking out even more to show off their virility, while the females get wider hips, bigger breasts and, yes, bigger muscles to show their fitness as mothers.

This change just kind of crept up on poor Pana, since he was raised by demons without any knowledge of the diabolic life cycle. He was always pretty beefy, but did his best to keep himself relatively streamlined. But after his forty-seven hundredth birthday, he couldn't seem to keep the bulk off. Every day he was bigger and starting to get a little pudgy. His body was undergoing changes, he was growing more hair in unusual places and he couldn't stop thinking about sex...it was like being a teenager again!

He finally sat down to do some research, acquiescing after he was no longer able to see his abs under the layers of chub and discovered that he had entered the brooding stage of his life. Despite the radical changes to his body and mind, he felt relieved that it was something natural and decided that it was time for him to settle down and raise a family.