Demi hesitates for a moment, then slowly opens the door and peeks inside, her cheeks still flushed. "I-I shouldn't have barged in like that. It's just... I thought I heard something weird." She bites her lip, trying to avoid looking at your exposed member. "A-anyway, I'll just go..." She starts to close the door again.

Demi pauses, her curiosity piqued despite her embarrassment. "W-well, I thought I heard some... strange noises coming from your room." She shifts uncomfortably, still avoiding eye contact. "But I guess I know what they were now." She smirks slightly, trying to play it cool. "So, what were you watching that got you so... excited?"

Demi's eyes widen in shock. "W-what? No way! I'm not joining you for that!" She blushes even more, clearly flustered by the suggestion. "Besides, I have a boyfriend, remember?" She crosses her arms, trying to look stern. "And even if I didn't, I wouldn't do something like that with my brother!"

Demi takes a step back, her heart pounding. "I-I don't want to play around with you like that! It's wrong!" She looks away, trying to hide her growing curiosity. "And I would never cheat on my boyfriend. I love him." She bites her lip, her resolve wavering slightly. "S-so, can we just forget this ever happened and move on?"

Demi's face turns bright red. "I-I did not! You're imagining things!" She huffs, trying to maintain her composure. "I was just making sure you were decent before I left!" She glares at him, but there's a hint of amusement in her eyes. "You're so full of yourself, you know that? Thinking I'd be interested in your... your thing." She gestures vaguely in the direction of his crotch. "It's not like it's that big of a deal or anything." She shrugs nonchalantly, but her cheeks betray her true feelings.

Demi's breath hitches, her heart racing. "W-what are you talking about? I don't know what you mean." She tries to sound dismissive, but her voice wavers slightly. "And even if it was... big, so what? Size doesn't matter." She looks away, her cheeks burning. "I'm not interested in your... your thing. I have a boyfriend, remember?" She crosses her arms, trying to convince herself as much as him. "So, can we just drop this now? Please?"

Demi's eyes widen, her curiosity getting the better of her. "W-why? Why is it bullshit?" She bites her lip, trying to maintain her composure. "I-I mean, I don't really care, but... just tell me." She looks at him, her expression a mix of defiance and intrigue. "And don't call me 'sis' like that. It's weird."

Demi's heart races as he steps closer, her breath hitching. "W-we're not friends! And I'm not curious!" She tries to sound firm, but her voice wavers. "I-I have a boyfriend, remember? I'm not interested in... in anything else." She looks away, her cheeks burning. "S-so, can you just... just put some clothes on and act normal? Please?" She hugs herself, trying to hide her growing arousal.

Demi shivers at the touch, her heart pounding. "I-I'm not your little sister! And I'm not curious!" She glares at him, but her eyes betray her true feelings. "I-I just want to forget this ever happened, okay? Can we just... just go back to normal?" She looks at him pleadingly, her resolve crumbling. "Please, Lorentz? I don't want things to be weird between us." Her voice is soft, almost vulnerable.

Demi hesitates for a moment, then nods slowly. "O-okay, that sounds good." She takes a deep breath, trying to calm her racing heart. "I-I'll go get some snacks and we can watch something." She starts to leave, then pauses at the door. "And Lorentz? Let's just... let's just forget this ever happened, okay? It was a mistake." She looks at him, her expression serious. "We can't let it happen again."

Demi raises an eyebrow, curious. "What's that?" She crosses her arms, waiting for his response. "And don't think you can just charm your way out of this, Lorentz. I'm serious." She tries to sound stern, but there's a hint of amusement in her voice. "So, what's this one thing you want me to promise?"