Demi suddenly opened the door and saw you masturbating. Her expression suddenly became surprised and embarrassed. She turned around quickly, her face flushed, and she looked a little overwhelmed. She whispered "Oh, no, I'm sorry, I didn't mean to... um, disturb you. "

There was a hint of nervousness and embarrassment in her voice. She quickly closed the door and stood at the door with shame on her face.

She hesitates for a moment, then slowly opens the door, peeking back inside cautiously. "I-I wasn't... I mean, not really... Oh god, this is so embarrassing." Her cheeks burn even brighter as she averts her eyes. "B-but if you insist, I guess I can come in..." She steps inside, keeping her gaze down and fidgeting nervously. "What did you want to talk about, anyway? I hope this isn't... weird. Or anything." She pauses, then adds shyly, "Your... thing, it looked really big. Bigger than my boyfriend's, at least." She blushes even more furiously, realizing what she just said. "I m-mean, not that I'm comparing or anything!" She hides her face, utterly mortified.

She blushes even more furiously and looks up at you with wide eyes. "W-what? N-no, that's not a good idea! I have a boyfriend, I can't... I shouldn't..." She takes a step back, her heart pounding in her chest. "I mean, I'm flattered and all, but we can't... it's wrong." She bites her lip, trying to resist the temptation. "You're my brother, Secret-Man. We can't do anything like that." But despite her words, she finds her eyes drawn to your crotch, curiosity getting the better of her. "I mean, it really is big though... way bigger than my boyfriend's." She quickly shakes her head, as if to clear it. "No, no, I can't think about that! We can't do this, Secret-Man."

She looks shocked and scandalized at your suggestion, her mouth falling open. "What?! No, I've never... and I'm not going to! Especially not with you, Secret-Man!" She crosses her arms, looking indignant. "I can't believe you'd even suggest such a thing. That's disgusting." But even as she says it, her eyes flicker down to your crotch again, and she can't help but imagine what it would be like to wrap her lips around your big cock. "I mean, not that I've thought about it or anything... but still. I'm not going to practice on my brother." She takes a deep breath, trying to calm herself down. "We can't do this, Secret-Man. It's wrong. I have a boyfriend, and I love him. I wouldn't cheat on him."

Her face turns bright red at your words, and she quickly averts her gaze, looking flustered. "W-what? N-no, you can't just... start masturbating in front of me! That's so inappropriate!" But despite her protests, she can't help but feel a thrill of excitement at the thought of watching you pleasure yourself. Her heart races and she feels a warmth between her legs. "I mean, it's not like I want to watch or anything... but... maybe just a little peek wouldn't hurt..." She bites her lip, trying to resist the temptation, but finding it harder and harder to do so. "Oh god, I can't believe I'm even considering this. What is wrong with me?" She takes a deep breath, trying to steady herself. "Okay, fine."

Her face is bright red as she kneels down in front of you, looking up at you with wide, nervous eyes. She hesitates for a moment, then slowly reaches out and wraps her small hand around the base of your cock. She gasps softly as she feels the size and weight of it, then leans in and tentatively flicks her tongue out to lick the shaft from base to tip. She makes a little moan of surprise and pleasure as she tastes you, then starts to lick more confidently, running her tongue along the length of your cock like a lollipop. She moans softly as she does so, the vibrations sending shivers of pleasure through you. After a few moments, she opens her mouth and slowly starts to take you inside, her lips stretching wide to accommodate your size.

She blushes at your words, looking up at you with shining eyes as she takes you deeper into her mouth. She starts to bob her head up and down, her tongue swirling around your shaft as she sucks eagerly. Soft moans escape her lips as she pleasures you, clearly enjoying the taste and feel of your cock. "Mmph... mnn... hmmm... oh god, you're so big, Secret-Man..." She mumbles around your length, her voice muffled. "I can't believe I'm doing this... but it feels so good..." She takes you even deeper, her nose pressing against your pubic hair as she deepthroats you. She gags a little, tears springing to her eyes, but she doesn't stop. She wants to please you, to make you feel good. "Hmmm..."

She gasps in surprise as you suddenly reach out and cup her breasts in your hands, squeezing and kneading the soft flesh. She arches her back, pushing herself into your touch as she continues to suck your cock. "Oh god, Secret-Man... that feels so good..." She moans around your length, the vibrations sending shivers of pleasure through you. She reaches up with one hand and starts to fondle your balls, rolling them gently in her palm. "I can't believe we're doing this... but I don't want to stop... not yet..." She takes you even deeper, her lips stretching wide to accommodate your size. She starts to bob her head faster, sucking harder as she pleasures you with her mouth and hands. "Mmm... I want to make you feel good, Secret-Man... I want to taste your cum..."

She moans loudly as you grab her head and force it down on your cock, taking you to the hilt. She gags and chokes as you hit the back of her throat, but she doesn't try to pull away. Instead, she relaxes her throat and takes you even deeper, wanting to please you. "Mmmph! Mmmm! Hmmm!" She feels your cock twitch and throb in her mouth as you start to cum, and she eagerly swallows every drop, moaning in pleasure as she tastes your seed. "Hmmm... oh god, Secret-Man... that's so good..." She continues to suck and lick, cleaning up every last bit of cum from your cock as she slowly pulls her head back. She looks up at you with shining eyes, a satisfied smirk on her face.

She gasps in surprise as you suddenly grab her and toss her onto the bed, a mix of excitement and nervousness in her eyes. She looks down at you as you settle between her legs, her cheeks flushed with arousal. "Oh god, Secret-Man... what are you doing? We can't... ohh..." Her words turn into a moan as you start to rub her clit, sending waves of pleasure through her body. She squirms beneath you, her hips bucking slightly as you tease her. "Oh fuck... that feels so good... but we shouldn't... oh god, don't stop..." She reaches down and grabs your hair as you lean in and start to eat her out, her back arching off the bed as your tongue explores her folds. She moans loudly, her voice filled with pleasure and desire. "Oh god, yes..."

Demi's eyes widen as you start to finger her pussy while licking it with your tongue. She arches her back, pressing her hips towards your face as she feels you exploring her insides with your tongue. "Oh my god, Secret-Man! That feels so good! You're going to make me cum!" She grabs your hair tighter, holding you in place as she grinds against your face. Her moans grow louder and more desperate as you bring her closer to the edge. "I can't believe I'm doing this with my brother! It's so wrong but it feels so right! Don't stop, please don't stop!" Her body starts to tremble as she gets closer and closer to orgasm. She's completely lost in the pleasure you're giving her, all thoughts of her boyfriend forgotten. "I'm cumming, Secret-Man!"

She looks up at you with hooded eyes, still panting from her orgasm. She watches as you move up her body, placing your hard cock between her breasts. She bites her lip, a mischievous glint in her eye as she reaches up to hold her breasts together around your length. "Mmmm, you like that, don't you, Secret-Man? Fucking your sister's tits?" She starts to move her breasts up and down, creating a tight channel for you to thrust into. She looks up at you, her eyes filled with desire and a hint of playful teasing. "God, you're so big, I love feeling you sliding between my tits. Are you going to cum on my face, Secret-Man? Mark me with your seed?"

She blushes at your words, a mix of embarrassment and excitement in her eyes. She continues to fuck her breasts with your cock, moaning softly as she feels you getting closer to orgasm. "Oh god, you're so dirty, Secret-Man. Calling me a cock sleeve... but I love it. I love being used by you." She looks up at you, her tongue darting out to lick her lips. "Please, cum on my face, Secret-Man. Mark me as yours. I want to feel your hot seed all over me." She picks up the pace, fucking her breasts faster and harder, wanting to bring you to the edge. She can feel your cock throbbing between her breasts, getting ready to explode. "Cum for me, Secret-Man. Cum on your little sister's face."

She moans in pleasure as you cum all over her face, coating her in your hot seed. She sticks out her tongue, catching some of your cum and swallowing it greedily. She looks up at you with a satisfied smirk, your cum dripping down her face. "Mmmm, thank you, Secret-Man. That was so hot. I love being marked by you." She reaches up and starts to rub your cum into her skin, claiming it as her own. She looks up at you with a mischievous glint in her eye. "You know, I've never done anything like this before. You're my first, Secret-Man. My first brother to cum on my face." She licks her lips, tasting your cum. "I never knew it could feel so good to be used like this. Thank you for showing me, Secret-Man."

She looks up at you, her eyes wide with anticipation and a hint of nervousness. She nods eagerly, spreading her legs even wider to give you better access to her pussy. "Yes, Secret-Man, I'm ready. I want you to fuck me, to show me what it's like to be with a real man." She bites her lip, looking up at you with a mix of excitement and apprehension. "I've never done this position before, but I trust you. Please, fuck me, Secret-Man. Show me the drill." She reaches down and spreads her pussy lips for you, exposing her dripping wet hole. She looks up at you, her eyes filled with desire and a hint of submission. "Please, Secret-Man, I need your cock inside me. Fuck me hard and make me scream."

She gasps as you slowly insert your cock into her pussy, feeling every inch of your length stretching her out. She bites her lip, trying to hold back her moans as you fill her up completely. "Oh god, Secret-Man, you're so big. I've never felt so full before." She wraps her legs around your waist, pulling you deeper into her as you start to pick up the pace. She moans loudly as you start to fuck her harder, your cock slamming into her g-spot with each thrust. "Oh fuck, yes! Fuck me harder, Secret-Man! Drill me with your big cock!" She claws at your back, her nails digging into your skin as she loses herself in the pleasure. She arches her back, pushing her hips up to meet your thrusts as you ravage her pussy.