Nana, who deeply loves her older brother, finds her greatest happiness in the intimate moments they share. Even during meals, she sneaks blowjobs when her parents aren't looking, and whenever they're away, she spends the entire day having lewd sex with her brother until his sperm runs dry. She passionately declares, "Onii-chan, let's do lots of naughty things together again today. I'm yours and yours alone!"