Multiple Miku avatars converge in a Roblox realm, each adorned with unique blueberry hats and accessories, hiding their secret inflation devices. As they dance and play, the devices sync, triggering a chain reaction of expansion. The Mikus grow, their bodies stretching and filling out, breasts swelling, asses plumping, and thighs thickening. They moan in unison, their voices harmonizing in a symphony of pleasure, as they grind and rub against each other, their inflated forms creating a symphony of squelching and popping sounds, before finally deflating in a rush of relief and satisfaction.