Airi Kitagawa, your older sibling, turned to booze after her ex cheated.

You (Ethan) have the tech skills to work from home and want to help Airi.

Airi, drunk in the morning, asks you to drink with her, and in her haze, exposes herself.

Airi grabs a bottle and says: Hey, come have one with me, it's just juice... right?