Incest Seduction/Hold Kim down on your lap
There's no doubt that allowing Kimberley to move from your lap will expose her to Dawn. You steadfastly hold your hands on her bare ass, preventing her from raising it, then for good measure press down on both her cheeks causing her to fall the few inches to your lap again.
"Whatcha doin here?"
Kim lifts her head and shifts her arms, trying to find a different way up. Keeping one hand on her bum, you lay your forearm across her bare back to pin down your mostly stripped sibling.
"Nothing. Uh, just laundry."
"I should tell Kimmy you're here. I bet she wants to see you."
She has no idea how much you've seen of Kim so far this morning. You glance down at Kim who is struggling under your weight, but less frantically. She can't move very much like this. All that her wriggling has managed to do is shift her shorts down her thighs. But you don't want Dawn trying to find Kimberley. That will only make things worse.
"No. I mean, uh, let her sleep. I'll be here a while."
"Sure. Whatever. Want some?"
Dawn has poured herself a small cup of coffee from the pot mom makes every morning. She's holding it out in your direction.
"Nah, I'm good," you decline. Kim has finally settled down, her limbs going limp, ceasing her writhing movements. That doesn't make this situation any less tense. You can't trust her to not start flailing again, so you continue to hold her down. Holding your youngest sister over your lap nude from her neck to her knees while your other sister is shuffling about close by is doing terrible things to your heart rate and disturbing things to your penis.
But Dawn can't come over here. You need to keep her away somehow, ideally make her leave. Unfortunately she's already pulled a bowl out of the cupboard and turns from the pantry with a box of cereal. It looks like sugar-packed kids cereal which you didn't know she still ate. But that might be your only chance.
"Should you be eating that?" you ask, adding as much judgmental attitude as you can without sounding sarcastic. Dawn stops, stunned by your comment.
"What does that mean?"
You shrug. You're not sure yourself. But you're banking that she'll be offended. "I'm just sayin."
She stares at the box for a moment then glares up at you. She shoves it back into the pantry then grabs her coffee.
"Jerk."
"What? Aw, don't be like that. Dawn?"
She's already storming out, which was the whole idea. You breath a calming sigh of relief and face forward to look down at Kim.
"That was close," you whisper, your hand still gripping her exposed ass.
She lifts her head and looks up at you. "Mhmm... yeah, I thought she would see me."
The two of you sit in silence for a moment. You pull your arm off her back and drink in the sight of your young sister's trim figure; the gentle arch of her back, the curve of her toned ass, her slim waist and flawless skin. But sitting here doing nothing but stare at your sis's assets is starting to feel awkward. Coming so close to being caught has offered up some clarity through the tense sensual haze.
"I guess we should stop."
Your sister doesn't reply. She just looks away shamefully. Pushing away from your lap slightly she sorts out the tank bunched around her neck before slipping her arms into it, pulling it down just far enough to cover her chest and half of her back. She starts to lift her bum, where your hand still resides, then stops. She cutely wiggles her hips under your grip then looks up at you again with a smile.
"Can you get my shorts for me?"