In a dimly lit attic, a brother and sister huddle together, their breaths visible in the cold. She's a virgin, haunted by religious teachings, but his proximity stirs something primal. He's a beacon of taboo, his cock straining against his jeans. She tentatively reaches out, tracing the outline, her heart pounding. He guides her hand, teaching her his pleasure. She whimpers, her pussy throbbing. He lifts her skirt, rubbing her through her panties before tearing them off, his tongue finding her wet, untouched folds. She gasps, her innocence shattering as she rides his face, her orgasm echoing in the quiet attic.