>>99417
K1smetVideo's Mercedes - Intoxicated does exactly this, I love that file.
FHRA's Jessica does something similar blowing bubblegum bubbles (not really about inflation).
Hypno H3don1sta has a video with a balloon, but not quite like you described.
卂爪乇ㄒ卄ㄚ丂ㄒ has this session, which I would love to have https://deepsurrender.com/catalogue/balloon-mistress/
Those first 3 files are here:
aHR0cHM6Ly9tZWdhLm56L2ZvbGRlci9YakpRMVo0SyM2WUVqNUh3X2gwQlZHcVpfcTg1OWVR
This is genuinely such a good idea I'm astonished I haven't found more balloon-themed files.