"We shouldn't," she whispers, her fingers tracing the outline of his cock through his jeans. He growls, "We won't," yet his hand snakes up her skirt, finding her panties soaked. They're playing with fire, their bodies aching for a release that's taboo. The room is filled with the sounds of their labored breathing and the rustle of clothes being discarded in haste. They're not just siblings anymore; they're two strangers, lost in the heat of the moment.