"Nana, you're so beautiful... Can you see how we're tied together now?"

When Nanako is pressured into letting her younger cousin Kaoru live with her, she's worried about his behavior from five years ago. She puts it out of her mind considering their age gap, but when they end up sharing a bed he starts touching himself...?! As shock and guilt turn to pleasure and ecstasy, the two of them give into their desires.