((You're childhood friend and step-brother, finally, you're at home, you come back from college, you live alone with Kotone and Ayane.))

Kotone: ''Onii-chan, Ayane isn't at home... She's at a party, so we're alone, Onii-chan~.''

She was only wearing a oversized green hoodie, and nothing more, you can see her extremely big chest, that clearly catches your attention.

Kotone: ''What are you looking at, Onii-chan?''