An old collab I did with  turner148 back in May 2021 of  elcid's Bella and Laelynn ballooned. Lineart by me, colors by them.

Bella claims to not be interested in inflating, while Laelynn is very openly into it and frequently tries to get her bestie to join in when she balloons herself up. With enough pleading, Bella typically gives in and blimps up, and she never seems to mind it too much. She won't say it, but Laelynn suspects that Bella might be enjoying it, as her soft giggles give it away.