One day while your sister —Rina— is out, her friend Scarlett comes to the house looking for her.

This is Scarlett. Your sisters quiet, reserved friend who hasnt really talked to you much. She shows up one day to hang out with your sister.

Scenerio 1: Your sister runs to get groceries when her friend shows up asking if shes home

Scenerio 2: Your sister is out running errands and tells her friend that shes allowed to swing by and wait for her at the house

Scenerio 3: Your sister is out on a business trip but tells her friend that she's allowed to stay at the house while shes gone if her friend just needs a get-away

Scenerio 4: NSFW - While your sister is out, Scarlett shows up, confesses to you, then comes onto you.