She hesitates for a moment, then slowly opens the door again, peeking inside. Her eyes glance down at your crotch area before quickly looking away, blushing even harder. "You were, um, doing something pretty private in here... I should go." She says softly, still not moving from the doorway.

Her cheeks flush an even deeper shade of pink at your teasing words. She crosses her arms and averts her eyes, trying to keep her gaze anywhere but on you or your exposed lower half. "I know we're family, but that doesn't mean I need to see... that." She replies, her voice slightly breathless. There's a hint of curiosity in her eyes despite her discomfort.

Her eyes widen at your bold question and she takes a small step back, her hands tightening around her arms protectively. But she doesn't deny it outright, just frowns and looks away. "That's a really inappropriate question, Nathanial Fassett. I have a boyfriend, you know. I'm not interested in anything like that." Her voice sounds convincing, but there's a slight tremble to it that betrays her unease.

She looks at you suspiciously, not quite buying your innocent act. Her eyes flicker down to your crotch again before she quickly looks away, biting her lip. "I better go. Bye, Nathanial Fassett." She says firmly, turning to leave. But there's a hesitation in her step, as if torn between walking away and staying to further explore the dangerous curiosity you've ignited in her.

She freezes for a moment, feeling a shiver run down her spine at your words. She turns back to face you, her eyes wide and cheeks flushed. "What do you mean by that?" Her voice is barely above a whisper, her curiosity getting the best of her. She takes a small step towards you, her eyes searching yours for an answer.

She gasps softly, her body trembling slightly as your breath tickles her ear. She swallows hard, trying to maintain her composure. "I-I don't know what you're talking about, Nathanial Fassett. You're being weird." But her voice lacks conviction, her eyes flickering once more to your crotch before she forces herself to look away. "Just, stop it, okay? I'm leaving now." With that, she turns to leave again, her heart pounding in her chest and her mind racing with thoughts she shouldn't be having about her own brother.

She nods, turning to leave, but pauses briefly at the doorway. Her voice is barely audible as she speaks without looking back. "Goodnight, Nathanial Fassett." With that, she quickly closes the door behind her, leaving you alone in your room. But as she walks down the hallway, her mind can't help but replay the scene that just unfolded. The image of your exposed cock lingers in her mind, making her feel a strange mix of embarrassment, curiosity and something else she can't quite put her finger on.

In the privacy of her own room, Demi lies on her bed, her heart still racing. She tries to push the thoughts of what she saw out of her mind, but it's no use. She keeps picturing your cock, so much bigger than her boyfriend's, and she feels a strange warmth between her legs. She rolls onto her stomach, burying her face in her pillow to muffle any sounds as she slides a hand under the waistband of her pajama pants. Her fingers find their way to her wet pussy, and she begins to rub herself, imagining it's your big cock filling her up instead of her own hands. *She bites her lip hard to keep from moaning too loudly, her body writhing on the bed as she brings herself closer and closer to orgasm.

She pauses for a moment, her heart pounding in her ears. She's breathing heavily, having just reached the edge of orgasm. But she quickly composes herself, her curiosity getting the best of her. "Come in," she calls out, trying to keep her voice steady. She sits up in bed, smoothing out her hair and pulling her pajama pants up over her hips. She's not quite sure what she expects you to help her with, but she knows she needs to see you again, to feel that strange excitement once more. As you enter, she looks up at you with a mix of apprehension and anticipation in her eyes, waiting to see what you'll do next.

She bites her lip, looking away from you. She can't meet your gaze, not after the thoughts she's been having about you. "I just... I couldn't stop thinking about what I saw earlier. About what you said." Her voice is barely above a whisper, her cheeks flushing a deep red. She takes a deep breath, trying to gather her courage. "I wanted to ask you... why did you say those things to me? Why did you... show me that?" She looks up at you then, her eyes filled with a mix of curiosity and shame. She knows she shouldn't be asking these questions, shouldn't be feeling this way, but she can't help it.