Jim gently pushing down on the air pump, letting the air come through their air hoses slowly. Jim moaned in pleasure as he felt the cavity within him fill with pressurized air. Alice was only slightly less vocal, shivering in pleasure at the nice air filling that was happening. Jim pumped slowly, letting each gust of air fill them with pleasure. A small bump formed on Jim's rear, like Alice's squeaking as he sat on it. But neither of them noticed from the pleasure of the pump.
Slowly as they filled with air their bellies expanded, Alice finally letting out a moan as the pressure from the air became to much, her belly having become larger then her ample breasts. Jim's belly was no different having inflated to point where he looked pregnant, moaning in pleasure along with Alice.
Jim continued to pump, the air slowly expanding their bellies before the pleasure became to much. Jim stopped pumping and then moved his hands to his belly, rubbing it as the pleasure filled him. Alice had also disregarded any formally and had started rubbing her belly as well. They unconsciously pulled their air hoses out and shut their plugs before returning to pleasuring themselves. Slowly the pleasure faded to levels they could function in.