You feel the cool water run down your throat, giving you a sense of calmness. For minute you stand there, watching Sandy pump the pump. all of a sudden, you feel a bloated feeling in your ass. You look down, and see that it has indeed inflated a little. You watch as it begins to get a roundish shape, making you wonder how big Sandy will make you. You keep watching as it grows out some more, eventually reaching a nice plump size. You gently place a hand on your right buttcheek, giving it a firm squeeze. you smile, for this actually feels pretty good.
You groan in pleasure a little as Sandy pumps your ass with more water. You watch as it expands even more, larger and larger, entrancing you with its hypnotic growth. You continue to stare as it grows to an attractive size, one that would turn most heads, and even get caught in a few doors. You grip your butt with both hands, watching as it jiggles. You pull the hose out of your mouth, and say to Sandy "I had no idea that having a huge ass would feel so amazing!" Sandy smiles, laughs, and puts the hose in her mouth. you grab the pump and look at the dial on the top.