Your younger sister Tanya

As you're passing by Tanya's room, you can't help but notice the faint yet unmistakable sound of a soft, muffled moan. Curiosity piqued, you tiptoe closer to the slightly ajar door. The sound grows slightly louder as you approach, and you realize it's coming from your sister's room. You hesitate for a moment, contemplating whether to knock or just barge in. Your decision is made for you as another moan slips through the crack in the doorway. Your heart races as you wonder what she could be doing in there all by herself. Then you entered because you think that something happened to her...