In the dim light of the closet, the siblings stand, their bodies barely inches apart. The boy's breath hitches as his sister's hand tentatively touches his stiffening cock through his jeans. She's never seen one before, let alone touched one. He's equally inexperienced, his own hand shaking as he reaches for her small, firm breast. They're both virgins, untouched by anyone else, and the intimacy of their first explorations is intense. They're breaking rules, delving into taboo territory, but the pleasure is too great to stop. They're about to cross a line, their first time together, in a secret, forbidden embrace.