Manufactured Misfortune/Day1-Anatomy-Med/Knock on Emily's door
You softly rap your knuckles against the door, not wanting to draw attention from anyone other than your sister. The soft moans from your sister's room are stopped by a shrill squeak. Silence follows. You say nothing and neither does she. You did knock very quietly. Maybe she's questioning whether she heard anything. And now you're curious if she's going to start up again. A moment later the door opens suddenly but only halfway. You and your sister both surprise each other standing on opposite sides of her door.
"Oh!" she says. "Umm. What's up?"
"Nothing," you reply, your semi shifting in your pants. "What are you doing?"
"Nothing." Her face betrays her. Not just her expression, but the flush rosiness of her cheeks as well. She's hiding behind the door and is at least wearing a shirt, but you can see the profile of her bare hip just below the edge of visible hem. Maybe she has panties on. But maybe not.
"Really?"
"Yeah."
"Well it sounded like something."
"Like what?"
You nearly reply but stay silent instead, wanting to be coy. She stares you down. You both know what she was doing just now but you aren't going to outright call her on it. It's not as if she would admit to it even if you did. But waiting, drawing this out, making her think about telling you, that's better than anything you could say.
With X's sibling strip tease fresh in your mind you can't help but picture your own sister standing naked on the other side of this door. With all those O-faces Em gave you today paired with the sound of her moaning it's not hard to imagine her cumming as well. Part of you hopes she's masturbating right now out of view as she stares into your eyes. Her cheeks seem to be getting rosier with every passing moment.
"I'm just... getting ready for bed," she adds sheepishly.
"Ohhh, okay then... G'nite."
"G'nite." Her door is nearly slammed shut in your face from being closed in such a hurry.
You smile to yourself but don't go anywhere just yet. It's silly how hot that was, staring Emily down like that. Even though you interrupted her, you wonder if she's still horny enough to continue. You wait at least 2 minutes outside her door straining to hear for any possible sounds of activity from within.