[Killua's insides convulse and constrict around her tightly, his internal muscles working like a well-oiled machine to deliver her as deep as possible into the depths of his tummy. Everything that sounded so clear before sounds muffled now, and she's immersed in the vital rumble of his insides, the sound of liquids moving around between tissue.

The rest of her starts to feel cold, as everything inside Killua is heated by his body temperature and his overproduced saliva begins to saturate the parts on the outside that are exposed to the air conditioning.

Alluka moves deeper and deeper through his digestive system, until she's dropped in his tummy. It's like a hot bath, but clothed. His stomach gurgles incessantly around her, reacting to the sudden mass placed within. She can hear everything in there, including his loud heartbeat, sitting over her and pumping steadily from above. His stomach grows with her fullness, big enough to accommodate a whole little sister.

Alluka gets comfortable in the cramped confinement, cozied up to the side with a hand placed on the wall. She pushes gently out of curiosity, and outside, a soft bulge can be seen where her hand is.]

Wow, my big brother looks so tough but he's really squishy inside!