Incest Seduction/Ask your brother how it's supposed to work
"Well then how is it supposed to work?" you ask with a grumble.
"Kimmy... It's not."
"What does that mean?"
"It means that we can't do this."
"But we can! You kicked out your roommate so there's no reason we ca-"
"No, this!" Zack gestures between the two of you. "This isn't okay. It's not right. I'm telling you, we're not messing around. We're brother and sister."
Your jaw drops in shock. Then you hit him. "What the hell does that mean?"
"You heard me, Kimmy."
"I sure as shit didn't!" you fire back. "You said you were okay with all this, with us. Last weekend Mom jerked you off into my mouth, Z. How are we not messing around all of a sudden?"
Zack waves his hands and shakes his head. "I don't know what any of that was, okay? You jerked me off, then mom did, and then I..." He pauses to pick his words. "...let you fuck me. I have no idea why I went along with all that, but I know it was wrong. So... I'm sorry."
"I'm not." Although you're not sure what you are. You're a mix of emotion. Confused and sad. Angry and disappointed. With a mild scowl you add, "But what about Cam's party? I gave you a BJ in front of lots of people. Why was that okay?"
"I mean, that wasn't either, but..." He shrugs and struggles for words. "I- I was drunk and you were just, like, a waitress. The guys were egging me on and you were all... Frankly it'd be suspicious if I didn't let you. But I had tried to redirect your energy, sis. That's why I suggested the waitress gig to start with. You're just..." He shakes his head again, "I'm just trying to do the right thing Kimmy. And you keep making it so hard..."
You look down. "Cuz I want to."
"You want to make things difficult?"
"No. I want to make you hard."
"Kimmy!" he scolds you with a hushed tone. "See, this is what I'm talking about! Damn do you need to chill."
"Don't tell me to chill! This is like y- you're dumping me!" Your eyes get watery as you say it. You swallow the lump in your throat to hold your composure and save your makeup. He rubs the back of your neck beneath your ponytail trying to console you.
"Of course not. I can't dump my sister. That's part of the problem. You're my dorky sis. I still want you to be you, Kimmy. I hoped maybe you just needed to get it out of your system or something. I mean jesus, how much cum can one girl take!" he says with a chuckle, then clears his throat to correct himself. "But that has to be the end of it. I'm not 'dumping' you. I'm trying to do the right thing here."
"Don't! Don't do the right thing!" You grab your brother's wrist and pull one of his hands up onto your chest. "Do me!"
Zack looks down to where his hand has landed. He takes your invitation only briefly and softly gropes one of your small tits before he shakes his head and pulls his hand back.
"Cut it out Kimmy," he orders with a sigh, the insistence no longer in his voice. Is that a good thing? You have to keep pushing him to find out.
"No! I won't. I refuse. And you know why? You lost a bet. That's why."
"I- I know that. It's not..." Your brother huffs and sighs. He hates losing a bet. He hates welchers more.
"If you think this is 'icky' or something, like some 4th grader, well, fine. I suppose I can't make you like it, even if I want you to. But I'm not some 4th grader, Z. I'm an 8th grader. And I won, and you lost, and I want you to pay up."
Zack rolls his eyes. "Kimmy! Come on! This is not even fair! My school?!"
"You agreed to it," you note sassily.
"The party was one thing, when you were someone else, when half the room was hammered and the other half were high. But even ignoring the dorm rules, you've been here before as my sister! Even if we..." he sighs again, thinking through the logistics of it. "Like, you've already come in here dressed like this. How am I supposed to explain this to... anyone?"
"Well... then just make me your girlfriend already," you offer, trying not to smile at the thought. "If someone asks if I'm Kimmy then we'll just deny it. Tell them I'm Bethany."
"Jessica."
You squint your eyes and raise your chin a little. "I think I get to name my own secret identity."
"You already told Mike you were lying. Besides, I wouldn't date a Bethany."
You reply with a huff. "Yeah, and you won't date a Kimmy either."
"Listen. I just... This is the worst place for this Kimmy," he replies, ignoring your comment. "I'll just sneak you back out and drive you home and we can talk about all this another day."
The two of you go silent, neither of you particularly happy about how this has gone so far. Are you even making progress? Can you really reason with him? Giving him more time to come up with more excuses seems like a terrible option.