Offline/Emma doesn't need slime for her to help you
You put a hand on her shoulder, stopping her from standing. "We don't need Sparkles."
She fails to get up more than once before she realizes you're keeping her there. "Whut? You sure? How come?"
"Because you can be my Sparkles."
Her head tilts like a confused puppy. "I can? I'm Sparkles? But... I wanna be Bluey!"
"Yeah, whatever," you huff, rolling your eyes. "Just open your mouth."
She complies, dropping her jaw. You stick the tip of your cock past her lips and her eyes pop open. You thought she'd expect that given what you did to her slime earlier, but it still shocks her.
"My mouth?" she asks, pulling away.
"Yeah."
"That's weird."
"Just shuddup and do it."
You lift her hand off of your thigh and wrap her fingers around the middle of your shaft. Then you reach to the back of her head and pull her mouth onto you again. You spend the next minute guiding her hand up and down your cock, pulling your foreskin back so that your bare tip rests on her tongue, and bobbing her head a little to help show her how to blow you. When you pull your hands away she apprehensively keeps working your dick, looking up at you for approval.
Chipped remnants of nailpolish on the ends of dainty fingers, her warm tongue slickening your rod, here's your naked little sister softly blowing you in the middle of a field under the light of the moon. Your first ever blowjob, from your sister, still in grade school. Fucking crazy. Still feeling the buzz from all that beer, and a warm breeze on your shaft as it gently spills over Em's fingers, you run your fingers through her hair as she sucks you. This is utter bliss.
"Is this a trick? Aryoo making funna me?"
She had to go and ruin it, didn't she?
"No. Just keep going."
She sucks for a few more seconds then pulls off again. "This is a porn thing, isn't it? I bet it is."
"No. Lots of girls do this."
"No they don't."
"How would you know? What do you know about porn anyway?"
She shrugs, still pumping your shaft. "I dunno. I heard someone say that at school."
"Well this is... just a porn thing. Mom probably does it to dad."
Emma smiles wide and crinkles her nose. "Eww! No she doesn't... gross!" Even if she thinks that, after she stares down your dick for a few more seconds she starts sucking you again. Of course, being your sister, she can't go long without talking. "When're we done it?"
"You'll know," is all you tell her, getting frustrated as you pull her onto you again, holding onto her head now to try to lock her lips to your meat.
You're really hard, but as the minutes tick by you still haven't finished. Emma is too slow, or too gentle, or something, but she only gets slower as time goes on. Her eyes keep closing, but she's still trying, still sucking. With your sis looking tired, you take hold of your dick again.
"I'll finish it. Just keep your mouth open."
You start beating your dick furiously, the familiarity of your own hand instantly making your taint clench, while Emma rubs one of her eyes. Then she leans her head back and opens her mouth wide. Seeing her open up like that brings you over the edge, even if she might have just been sighing, and you blast a shot right into her gaping mouth, straight down her tongue.
Em immediately coughs on your spunk, her head shifting downward. Your next shot hits her square in the face, splattering right between her eyes. That shocks her, as if she doesn't know where it came from, and makes her turn her head away from you. As she rubs her forehead with her hand, spreading your cum with her palm, you fire again. A long rope lands as she's pulling back, stretching from the backs of her fingers down the side of her nose and over her cheek. She's leaning away from you now and as each shot gets weaker you can't quite make her face, although you feel compelled to try. You jerk and jerk and send splashes and droplets of cum flying along her chin and neck and down onto Emma's flat chest and stomach, some of it no doubt running further down the front of her body, but it's hard to tell exactly where it's all going in the darkness.
It only took a few seconds for you to make a proper mess of your baby sister, smothering her with your semen.
"Holy shit," you huff, suddenly out of breath again. Emma just sits there squinting at you, paralyzed by all your cum. "Um... good job, sis. That was... thanks."
You help her stand then glance around the clearing. Emma doesn't have your flashlight and you don't have her clothes. It's all been lost to the overgrown grass. After tugging your pants up, you immediately give up hope of finding any of it and follow your sister who is already trudging toward the cabin.
"Gimme a sec. I gotta pee."
She doesn't wait for you. Once you pee, shake and head inside the dark cabin you spot her already in her sleeping bag. You poke her with your foot but she just groans. Looking around, you try to spot what she might have used to clean up with, but even with the moonlight peeking through one of the small open windows it's hard to see much of anything.
You're too tired to put more thought into it. You strip down and crawl into your own bag, suddenly feeling just as sleepy as your sister.
*Knock Knock*
"Wakey wakey!"
"Mooom, five more minu-" You stop yourself, opening your eyes as you remember where you are, light streaming into your tiny cabin.
"Don't worry, you can sleep more if you want to. You were up so late!" You turn and sit up in your sleeping bag as Emma throws hers open. "Sweetie! What happened to your PJs?" Mom's tone is leaning more toward scolding than concern over your sibling's unexpected unclothed state.
Em doesn't respond. She just rises and quickly darts over to mom, giving her a big hug. Mom embraces her youngest, petting your sister's head and patting her back, then turns to you for an answer.
You shrug, your look of surprise thankfully passing for confusion. "It gets hot in here, so..." Glancing around, you point to the open window as proof. Mom 'tsk's a few times, shaking her head.
"Okay, well I know you've been skipping breakfast but I only came to tell you we're making waffles with bacon and sausage and there's plenty to go around, but only if you get up!" Mom then leans down and pats Emma's bum. "But please get dressed first."
"Yeah, thanks mom... you can go now," you encourage, trying to get her to leave.
"You alright sweetie? Something the matter?"
Emma has kept the side of her face pressed against Mom's shirt, eyes closed while hugging her tightly. She opens her eyes long enough to glance at you briefly. Once her eyes meet yours, Emma slowly shakes her head. Mom still ends up tilting Emma's head back to get a better look at her daughter and immediately starts scraping dried cum away from Emma's eye, as if it's some sleep crusty. Emma drops her head down when she realizes what mom is picking at, then scurries back into her sleeping bag to cover up.
"Try to lay off the scary stories, Justice. I don't want your poor sister worried that someone is coming for her every night."
You can't help but grin. "Coming every night. Got it."
Mom purses her lips, but decides to leave it be. "Alright. Don't sleep the day away!" She waves as she closes the door.
You and Emma lay back in your respective sleeping bags and pretend to sleep some more. You expect Em is going to start blathering away any moment about all manner of things, but the silence between you stretches longer and longer. Maybe only ten minutes, but that's a particularly long time to be laying next to someone without saying anything. Eventually you can't take it anymore.
"You were... hard to catch last night."
Your sis looks over at you and smiles. "You were easy."
"I wasn't exactly trying to get away."
"You were still easy."
"...You alright?" you finally prod.
Emma nods. "Yeah. It was just... weird."
"Yeah, I've never done that before, the whole blowjob thing. Pretty crazy!" You're far more excited than your sister. You're not sure how she feels about it. Maybe she doesn't know either. "It was good though," you note, smiling, trying to pull back.
"I guess," she shrugs.
"Well you were good," you add.
"Why?"
"Um, y'know, your mouth felt..." You check yourself, and try to keep the details sparse. "Well, I came lots. That's how you know."
She frowns at that. "It went everywhere."
"...Can I see?"
Emma sits up, opening her sleeping bag again, and turns toward you while seated, one hand cupping her crotch for modesty. Turns out she hardly cleaned off any of your cum, if at all. Dried little flakey bits of jizz pepper her body in little streaks and lines and dots, a wild spray across her chest, with the damage thinning as you look down her body. You're sure a bunch of it is coating the inside of her sleeping bag, and probably even more is caked into her pillow, but she tends to sleep on her side so her body is still littered with remnants of your spunk.
It's not all that obvious at first glance that there's anything wrong with her. She's pretty pale, so that's helpful. You're just lucky mom didn't see anything. Well, technically she did. Emma's face is a bit of a flakey mess after having smeared your cum to a thin sheen across her young features, but maybe it could be mistaken for a sunburn? Except for the thicker bits mom was picking at.
"I don't think I'm as good as Sparkles," laments your sibling, scratching at some cum flakes on her belly.
You have to smile. "Yeah, you're not. You're way better."
She looks up in surprise. She must think she did something wrong. "This doesn't feel better."
"Sorry sis. You're supposed to swallow." You sure would have liked her to. It would've avoided this mess. You also could not teach your little sister how to suck a cock. God is this awkward. "But... I didn't, um... I'll warn you next time."
"Next time?" she asks, raising an eyebrow.
"Well... if you wanted to try again sometime, is all I'm saying. Not that you have to."
Your sis stares at you intently for a moment, almost as if considering it right this second. Then she looks back down at her messy body. "How often do you need... help?"
"Well, I don't, uh... I dunno," you shrug. "Like, how often do guys need to do that?" She meets your eye again, curious to know the answer. "Probably once a day, for sure. But some guys do it more." Em's eyes widen a little before she returns to examining her body. You are also examining your sister, which is allowing your morning wood to return after mom's disruptive visit.
There's an extended awkward silence while Emma rubs at your dried cum. You really need to do something about that.