Demi looked at him and started panting. "Y-yeah," he mumbled, his voice just an aroused whimper. "It feels so good," he added.
Bryan's eyes widened as he noticed a blue splotch on Demi's skin. Before he could say anything, they were spreading all over him, and when Demi checked under his shirt he realized they were popping up all over him, dying his skin a soft blue hue. "This is weird," Demi whimpered, before letting out an oddly high-pitched grunt and feeling himself slim all over, his muscles becoming less pronounced, his stomach and figure pulling in and his hands and feet becoming smaller and daintier.
Instinctively, Demi pulled his clothes off, and saw his every inch of his skin had turned blue and his proportions were rapidly changing. Bryan thought he should probably be more grossed out by seeing his friend naked, but for some reason Demi was just turning him on. And then it got even better. Demi let out a gasp as his nipples perked up, the dark blue flesh suddenly feeling really sensitive, and started playing with them right in front of Bryan. As he rubbed and pinched the newly minted teats, he felt his chest swell, his body starting to grow breasts as it filled with more and more female hormones. His hips and butt filled out too, feminine curves forming around his midriff, and he started cupping his freshly grown boobs lustily.
Soon the most intense change to Demi's body began. He whimpered as he felt his testicles pull up inside him, starting to form into ovaries. Reaching down to his cock, he began to stroke it gently, feeling it start slowly shrinking back into his body, and then panted as his scrotum began to change shape, tightening against his body until it started to open into a slit, the skin reshaping into lips around a newformed vaginal opening. Soon his penis was only a couple of inches long, then less than an inch, and he was forced to stop jerking it and start rubbing it, an urge building in her to take a cock inside herself and be fucked.
Bryan stared at her in amazement. This device had turned Demi into a blue alien girl! But... that was impossible! He thought to himself, was she really an alien? Or maybe she turned into one of their favourite fictional characters? If she had, the change probably wasn't over...