The Capsule Incident

SPLAAAASH!
And there you were both underwater, still fighting with each other, fists bumping into faces, kicks giving and taking, as the spy did not refuse to give up the struggle. At some point he managed to slip through your grasp and grab you tightly from behind, while with his feet he pushed hard into the water cave's bottom and suddenly you were both forcefuly heading for the surface. And there you both were out of the water, for split second even, crucial timing as when you tried to draw breath from the exhaustive underground struggle, your sneaky opponent shoved something strange into your wide open mouth. Before you had the time react, you accidentaly swallowed it...
"So long sucker! Enjoy your caspule!!!" The spy yelled right at your face, before he pushed you hard down back into the deep water before he disappeared out of sight....
The effects were almost instant, as you felt a tightening sensation in your midsection and your mouth and cheeks puffed up like softballs. You felt the pressure becoming more intense from within as your eyes went wide in distress and your blurry vision started making out gaps forming between your shirt's buttons, as the sensation of all your clothes becoming tighter around your body kept increasing by the second and you flapped your hands around in the water as the inevitable was there, you were now inflating like a human balloon....
In a matter of seconds your entire midesction was growing rapidly into a balloon sphere, as all your buttons, from the lowest upwrads, poped out forcefuly as the inflating flesh was forming large gaps between them. Your limbs shot out to your sides like balloons too, as they too inflated with air from the inside and you soon were the size of small room at the bottom of the water cave, when your rapid ascension to the surface started....
Nothing but fear and distress was going on in your head at that moment as you emerged from the water with a defeaning sound like a whale emerging from the abyss, your size now almost like a hot-air balloon, sending tremendous waves around in the cave, as your gaze towards the cave's ceiling, full of spikes and stalactites, became even more distreful, as you could do nothing instead of waiting the inevitable, as your immobile and ballooning ascension was unstoppable...