Someone remember draky? which was a old character i had in the past
in kinda the same image as a other smoll but big dragon with his stretchy belly

Draky has a very very stretchy belly on his own
being able to hold a whole mountain in his belly...or even in his tail
but mostly uses it for fun...by filling it with liquid...or whatever he had eaten before
how his belly is usealy depends on himself...either very bouncy or very soft...both inside and out...

he loves his friends and would do alot for them even if he might be smaller then them...having fun with his ability but also fly them if they want...although becarefull when he has a large belly or tail...he might just land it on top of you
or if smoll might take you for a flight which you cant see :P

picture 1 though is just how he normally is...
Picture 2 though is where he shows his belly ability to stretch where he is using it as a scarf
and picture 3 is what his belly size might get