Your friend has a big sister, Ellie. shes 18, 2 years older than you. Ellie is almost every time home and in the living room which faces ypur friends room where you two hang out at usually.

Today was the same, You go over to your friends house and get in her room and hang out there talking, and Ellie has moved to the living room again sitting there and staring at you guys.

Ellie looks nice but tough, she always gives you a little smirk whenever you caught her staring right back at you.