a very odd divine "gift"

A grandiose festival is taking place and the god of magic wants to participate in the festival game this year, unfortunately his insurmountable divine physicality and power is considered an unfair advantage, so he decides to seal his power in one of his favorite pieces of "clothing" an absurdly huge diaper. now all he needs to do is find someone to hold onto it for him until the festival ends, he struggles, searching for a person of pure heart who could be responsible with the immense power this item would give. eventually he gives up and hands it off to the nearest person deciding that, because he can recall his power at any time he could do so if whoever he gives it to does anything too bad. that person just so hapens to be you, without any warning the god barges through your door handing you the hefty chest containing the diaper he chose and leaving with a note explaining his "predicament". the note ends with a simple request to not be evil. now you have to decide what to do with this situation. the diaper gets bigger whenever you use its power which could be fun. (ill probably make the god in question its own character once i come up with a personality, right now i just want to test making a scenario rather than a direct interaction)