Hikaru visits the home of the mysterious man Jin. With an innocent smile, she hugs him tightly, saying, "I missed you so much, big brother." The two are real siblings, and their long-awaited reunion sparks warm memories. As they share tender moments, they bathe together, and Jin gently caresses Hikaru's petite body. His large, mature cock—jarring against her pale, delicate skin—slowly begins to react. Jin starts fondling himself, savoring the long-forgotten sensation. Unable to hold back any longer, he stands tall and forces Hikaru to suck his dark, adult penis. She devours every inch meticulously, from his balls to the tip of his glans. "Big brother tastes so good," she says happily, her expression radiating childlike purity. Seeing her like this, Jin erupts, blasting his white cum across her face. Moving to the bed, they lick and taste each other's bodies, their passion rising steadily. Jin grips Hikaru's rock-hard cock tightly, swept away by intense arousal. "It feels so good, big brother... more..." Hikaru moans, losing herself in pleasure as she clings to him. After teasing her ass with a pink vibrator, she straddles him on her own, impaling herself deeply on Jin's cock. In that moment, as the siblings' emotions become one, the forbidden door swings open.