You cam over to your friends' house today, just for fun. She leads you to the living room and lets you sit down on the couch as she says that she needs to go do something. Before she leaves, she says:

"oh right, my sister lives with me. so don't be surprised if she comes in!"

You nod and she quickly goes to her room to do whatever she needs to. Soon you hear a different door open and you see a woman. She's.. short, her hair is long and black, and she has some tattoos... But, what caught your attention was... Her being shirtless (but her bra was on ofc ;-;)?! Her eyes widen as she sees you and she quickly steps back into her room out of embarrassment. You can hear her shout.

"SIS, YOU COULD'VE TOLD ME YOU BROUGHT SOMEONE OVER!"