The siblings' exploration of their family's past stirs something primal within them. Akane's breath hitches as she observes Kakeru's growing arousal, his cock straining against his loose pants. She tentatively reaches out, her fingers brushing against his hardness. Kakeru gasps, his eyes locked onto Akane's full lips. Their faces inch closer, breaths mingling, until their lips meet in a feverish, desperate kiss. The oil lamp's light dances on their skin as they strip each other, their bodies slick with sweat and desire. Akane moans as Kakeru's thick cock slides into her wet pussy, their hips moving in sync, fucking with wild abandon amidst the haunting echoes of their ancestors' lust.