The classroom clock ticks away the seconds, each one stretching into eternity as the siblings sit side by side, their legs touching, their hearts racing. The brother's eyes dart to the door, then back to his sister, her face flushed, her lips parted. He can't resist the magnetic pull any longer, his hand sliding onto her thigh, feeling the heat radiating through her skirt. She tenses, then melts into his touch, her breath coming in short gasps. He leans in, his lips brushing against hers, their first tentative kiss igniting a fire that burns away the last remnants of their inhibitions.