A sister that can't stop talking to girls

My youngest sister has a thing for girls and she flirts like crazy. Things younger siblings learn from older sister.

My youngest sister went on a hike with older girl. Sandy she's a doctor has a family practice.
They’re in the middle of a fucking forest, in public, even if there’s no one around. Any poor random hiker could stumble across them at any moment, but my sister feels herself throbing.
Sandy exhales and presses her thigh into her, against the crotch of her pants. Sister is so worked up already that she shamelessly grinds down against her, uncaring of how needy and pathetic she seems as she leans into the ounce of stimulation Sandy is giving her. She shudders, pulls Sandy closer, grabbing and bucking. the Doctor murmurs and kisses her deeply. She pushes her tongue forcefully into sister mouth, pulls back, bites down on her lower lip, Sandy grinds her hips, her thigh, up into her, and sister shakes harder, moans softly.
Sandy -She mewls, She can’t believe how good she feels already, feels herself blushing hotly over her cheeks and chest at how brazen they’re being. Sandy lets her rut against her instinctively, two bodies in a forest, animalistic.
Sister comes unexpectedly in her pants, shaking and arching between the tree bark and Sandy soft body. A rush of shame follows at how fast she’d finished, in her underwear like some pathetic teenage boy, but she can’t think about anything at all while she’s coming.
Did you just–
Don’t, sister whines with a little edge. Oh my god. She comes down from her high, feeling soaked and uncomfortable between her thighs. Sandy is still staring, thrilled and thoroughly amused. I’m so embarrassed, sister sighs and burrows her head into the warmth of the older woman’s shoulder.
Don’t be, baby, Sandy shushes, squeezing her waist. It was hot. I’ve never had a girl this young come so quick.
She’s making it worse by saying things like that, and sister feels deliciously humiliated. She whines deep in her throat and presses her hips harder against the thigh between hers.
Can you go again? Sandy whispers, sliding her hand lower to settle on her waist, She pulls a little, dragging sisters hips away from the tree trunk so her back arches a little. A little sliver of toned, sharp midriff peeks out from beneath her shirt and hoodie from the movement. Sandy wants to kiss it.
Sister nods weakly, desperate, and the Doctor smirks, slowly and pushes her hand down into soft panties. She runs her fingers slowly through her wetness, her come. It feels so much more sensitive than it would normally, from her orgasm and from the way it moves against her clit, and the girl sighs, bucks upwards.
I want to see it, Doctor Sandy says breathlessly. Are you – ok with that?
Yes, sister groans, encouraging. Fuck yes.
The doctor drops to her knees in the leaves and mud, easing her pants down around her knees and pulling her white panties down with them.sister feels exposed in the cool spring air, exposed knowing anyone could see them like this, and it only makes her more sensitive. She feels a fucking mess, slick and cool and wanting. She’d be lying if she said it didn’t excite her.
Sandy sighs, warm against her thigh, and glances upwards. So pretty. I love it, she murmurs, and ghosts her lips up the sensitive skin of her inner thigh. framing her clit prettily, the cut hairless pussy .Doctor leans in and licks her soft lips.
Sister shudders hard and tangles her hands into dark hair, pulling her closer. Fuck, she whimpers, and rocks up into Sandys warm mouth. Doctor is already good at this, every flick and curl of her tongue.
How many times do you think I could make you come? Sandy muses against her, her voice low and vibrating delightfully. She laps at her again, teases her entrance, moves back to flutter over her soft clit,
Find out, sister gasps, and sticks her hand up under her loose hoodie-t-shirt combination to palm her buddy breasts. Sandy almost always rises to a challenge, and she’s counting on her rising to this one too. The doctor works her tongue harder,
Sister keens, shudders Fucking hell, Sandy She’s immediately soothed by the gentle flat of Sandy's tongue, her hand firm against her trembling thigh.
She lasts longer this time, lasts long enough for Sandy to press two fingers inside her and begin eagerly fucking her with both hands and tongue. She curls her fingers, and at the exact time, takes sisters clit into her mouth, She sucks her off, bobs her head a little, eases back and flutters her tongue and then sucks again, Sister lasts all the way up to that point, and finally trembles through her pleasure, spilling her essence over Sandy's tongue, crying and swearing softly into the open air.
She rides out her pleasure, and then pushes Sandy head away gently, overstimulated and sore and uncomfortably slick. She’s dreading pulling her pants back up and having to walk the hour back to campsite this wet. Something in her feels excited about the aching humiliation of walking back still sticky with the evidence of their sex, though – there’s something a little pathetic and embarrassing about it, and she’s finding that that sort of thing turns her on more and more lately. She wonders if they’ll see any other hikers on their way back, if it will be obvious what they’ve done here.
Holy shit, she pants, pushing her head back against the rough bark of the tree trunk. She strokes through Sandy's hair, brushing the pad of her thumb over the curve of her ear as she catches her breath.
Good? Sandy murmurs, smirking beneath her, still on her knees in the dirt.
We better be going back my sister says, yes Sandy says breathlessly we can do this again? Sister looks up at her only if I can do you next time as well.