In the dimly lit confines of their shared bedroom, a curious sister can't resist the allure of her brother's sleeping form. She gently wraps her hand around his thickening cock, stroking it to life as he stirs in his slumber. His growing length pulses in her palm, awakening a hunger she can't suppress. She leans in, her breath hot on his skin as she takes him into her mouth, tasting the salty pre-cum beading at his tip.