Twin Jealousy Part 1

"HAHA!!! Just cannot believe you fell for that, sis!!!" Gloria yelled from a few feet away, revealing herself from the bushes where she has been watching secretly her plan unfold, as Rose exhausted from her jogging training, at the absolute need of a drink, ducked down to a draft sign that Gloria had placed there as a trap above a thick purple hose, that wrote" COLD WATER". Rose without any second thought, quickly shoved it in her mouth dumbly, without even noticing the powerful super-glue on the plastic edges of the tube, resulting in the hose being firmly stuck in her mouth as Gloria kept yelling to a tank track nearby...
"Let her have it boys!!! Let's see how big my sister can get!!!!" Gloria kept yelling, as Rose's expression went from worried to terrified in seconds, as she watched a powerful bulge of air, travel from the air-tank of the truck througout the entire hose, menacly approaching her. Rose's cheeks were the first to bloat, when the powerful stream of gas hit her face, her eyes going wide in distress as she tried to moan though the muffled mess of her lips and the hose, as the air started inflating her up like an inflatable love doll... In a matter of minutes her curves shot out to 5 times her original fit size, her expanding breasts stretching her black tank-top from the inside a they reached the size of beach balls, shine and bulgy all over, streams of pressurized air leaking from her nipples, while her thighs and ass were steadily bloating wider from bellow, to the size of truck-tires, overstretching her blue leggings to its limits. 
"I always wanted to see what i'd look when inflated... it's a good thing i have a twin sister then!" Gloria yelled out in an outburst of laughter, signalling the tank operator to crank the air knobs even higher, as she kept watching poor Rose's inflation rate tripling by each passing second, witnessing her own sister over inflating like an hourglass balloon in the evening light of the park...
"Looks like i'll be the only one left after this.... all the glory will be mine!!!" Gloria continued in an outburst of egoistic power trip...
"Oh yes... I guess Rose will be the biggest in the family, just for now..." she kept laughing, as Rose's massive shadow kept covering big parts of the park, ascending in the evening sky almost 30 feet in curvy over inflated width by now...