*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?"