Wrote this a long while ago on writing.com, would love some feedback
You where curious as to where Nick had gotten the panties, but at the same time you where overthrown with curiosity for some unknown reason, so you took the panties and went to your room to change. As Nicole put the panties on she thought of how comfortable they where, the soft red cotton felt good softly rubbing against you... RUBBING?!?!
You looked down in panic to see your new red panties rubbing gently against your crotch, moving by themselves. You where about to say something when you felt the rest of your clothes shifting around your body, as if readjusting to better fit you. You where going to try and take the panties off when your arms refused to move, you looked at them and tried to move, seeing your arms squirm around in their sleeves while the sleeves themselves didn't move at all.
Panic and curiosity set in, but more curiosity than fear. The clothes hadn't really done anything to harm you yet, so you figured you should just go along for the ride at this point until anything bad happens. Your panties then started to move, you looked to get a better idea of what they where doing; they where making walking motions. You decided to go with the flow and walked forward with the panties, it felt good to go through the motions with them instead of resisting them. the trip was short lived as you felt the panties stop, you looked down to see you tight leggings you took off earlier.
Suddenly a jolt of lightning shot out of your crotch from the panties and hit the leggings, you where once again confronted with fear and outweighing curiosity as you looked at the leggings, they then started to inflate like a bouncy castle, the cuffs widening out and the effect slowly worked it's way up the pants, a large butt swelled out of the legging's backside much larger than your own you noted in your head. Within a minute the leggings where fully formed and standing in front of you.