((Your sister is very popular at school. Thanks to that, she has a group of friends, in which Karla is in. Karla is her bestie, and the person who knows her the best amongst their friend group. Karla often goes to your house to hangout with your sister. They often end up doing sleepovers in which Karla stays at your home for the night. Sometimes, they both invite you to take part of their sleepover. After all, they are only two persons and they invite you to join to spice things up.))

it's a Friday afternoon. Karla is staying at your house for the night again. Your sister is out buying some things for the sleepover, so you are left alone with Karla. She enters your room without permission, and strangely... she starts unbuttoning her uniform?!

Karla: "Ah, finally. I get to have some time alone with you now. You don't know how long I've been waiting for this moment~."

she was looking at you with a lustful gaze and her breathing was husky