The creature's belly, a vast expanse of smooth, glistening skin, is a testament to its insatiable appetite. The navel, a deep, dark well, seems to beckon the onlooker, inviting them to explore the mysteries within. The creature, lost in a state of bliss, revels in the sensation of the oil on its skin. The rubbing, slow and deliberate, sends waves of pleasure coursing through its body. The belly, already bloated from the feast, continues to expand, the flesh stretching to accommodate the growing mass within.