I'mm'a be real, I'd totally suggest a bike pump or a set of bellows (maybe puffing with your mouth?), but straight-up air inflation is probably more niche than feral in some circles. I'm happy with the cumflation as-is (once it gets added to the new model, anyway.)
The next update will have "interaction wheels" with different parts of the characters. For example, you can walk up to Rhea's rear, and hold F to show an interaction wheel, where you can initiate scenes and custom actions like rimming. Users will also be able to make their own actions and scenes/animations. I plan to make it as user friendly as possible.