Another device for inflation is a pipe with gas and vertical taps with nozzles (although I am a bit sadistic, I cannot afford to have a whole real wide pipe inserted into someone with a swing, this is overkill). Subject is chained to the floor by both feet and is unable to escape, heh
(As well as jumping off the tap from the strain, so be careful)

Any gender
Any spesies
SFW only
Little changes is ok

✴ Fix Price - 67$
Write "I take!" in the comments if you need to get a slot.

I will start after 100% prepayment.
PayPal, USD and RUB