"It just keeps growing! How are you not seeing this?!" She said, jiggling her butt with her straining underwear.
You feign ignorance, but with every jiggle and wiggle, it looks like 5 new pounds settle into the growing buns.
"No, I don't know what you're talking about, let me try? Maybe i have to do it.." you innocently suggest.
Frustrated and desperate for confirmation of sanity, she leans in toward your sitting figure, and lets you exercise the flesh with your hands. It seems to grow faster with urgency under your fingers, prompting her hips to widen to support the new load- her supple mass quickly fills your arms. About 50 lbs ago she began rhythmically pushing against you, swelling with each movement, and now continues with more passion, breathing heavily as you're almost entirely enveloped in her monstrous, two-exercise-ball-sized rear.
The chair loudly protests against the extra weight with a sound like crackling bristles, but tentatively holds. You're both startled out of your expanding flesh hypnosis.. she smartly remarks;
"We should take this to the bedroom"