Time over (Patreon)

Dialga, the goddess of time, was challenged to fight a human, but not before making a deal that if she won, the human would become her servant, entertaining her however she wanted for all eternity.

Thanks to her powers she keeps the human alive for more than 1,000 years, but Dialga isn't all bad so she lets the poor thing venture into the pokemon world when she's satisfied but drags him back to her world when the time she imposes ends, she never sets a time standard, it all depends on how obedient her human was