Stop Abbie and tell her the truth about the spell

You grip Abbie’s wrist and pull her hand away from your cock. “Hold on. Wait. You don’t have to.” You tell her.

“I… I want to, Dave. I really do. It’s not right, but I do want to.” She smiles up at you, even though her cheeks have tracks of tears running down them. “I know this must be weird for you. Having your sister…” she shakes her head, as if she can’t really comprehend what she’s doing, or at least can’t bring herself to say it out loud. “I know I’ve teased you for a long time. I thought it was funny to make you blush.” She says quietly. “But… I really love you, like a brother, but so much more. You’re a better man than any of the guys I’ve blown or fucked. I know it’s not what society says is right, to feel this way about you, to want to… do things with you, but… I can’t help feeling that way.” Her words come out rushed, urgent.

She shakes her head, sadly this time. “I know you’re probably grossed out by the idea, by what I just did. I'm your sister. I can’t believe I did… this.” She gestures to her naked body, and your open fly. “It’s just… when you said you wanted a girl to do this for you, I realized how much I wanted that for you, and I wanted to be that girl.”

You’re too shocked and guilty to know how to respond. Guilty because you made her this way with the spell, but especially ashamed because you are so turned on by your own sister and her confession of how much she wants to please you.

She bites her lip, her eyes stay down on the floor in front of you, avoiding eye contact. “I try to hide it from you and mom… but I’m kind of a slut. I’ve done things with a lot of guys, some of them pretty kinky. I never thought I was this bad a pervert though.” She shudders. “I mean, to want to do everything I’ve ever done with a guy with my own brother, and more. I must be fucking sick.”

Your sister looks so distressed and conflicted; you realize you have got to tell her the truth. “I need to show you something, Abbie.” You turn to the computer and pull up the webpage with the spell. You get out of your desk chair and offer it to her. “Read this.” You tell her. As she reads, you zip your fly back up and try to explain. “I didn’t think it would really do anything. Like, magic… I thought it was obviously not real, right? And I definitely wasn’t trying to do it to you. I was thinking about a girl in my English class. It was just a stupid fantasy. I was bored and horny, and it was just for a laugh. I’m sorry. I’d take it back if I could. Sorry.” Your words are rushed, and you think you must sound like you’re babbling.

Abbie reads intently for a while. Then she laughs. “You fucking geeky perverted dick.” She grabs the front of your shirt and pulls you down to kiss you hard. When she lets you go, she says, “I thought I had some serious mental problem there for a while. Things make a lot more sense now.”

She looks up at you with a smirk. “Did you just skip over the part about needing a strand of hair, or you’ll get the nearest girl to you? You never read if you can skim, do you? Lazy fuck." She chuckles. "If you bothered to read and study, you’d get straight As. And you’d be dangerous.” She sighs. “It’s lucky you got me, and not some random girl from school. Or fuck! What if Mom happened to be closer when that spell went off! That would have been a disaster.”

You can’t believe what Abbie just said. “Lucky?!”

“Yeah, well how would you explain a girl you’ve never spoken to before, suddenly hanging all over you, and spending all her time at our house. Besides, you have no idea how much contact it means…” Abbie points to the computer screen, “when it says, ‘If the subject is denied contact, their obsession will only grow.’ It’s not like mom would let you move your little fucktoy into the house. She could have become a dangerous stalker. Plus, it says, ‘lifelong companion and responsibility.” I’m positive you don’t know the first thing about this girl’s personality. You probably never even had a single conversation with her. She could be a complete asshole, and you would have been stuck with her for life. And even worse, I would have been stuck with her hanging around until one of us moved out." She snorts.

Abbie spins in the seat to face you, stands up, and wraps her arms around your neck. Straining up on her toes to bring her face close to yours. “Face it, the best thing that could have happened with this spell is it affecting me. I already love you. I know you love me, and aside from trying to turn girls you hardly know into sex-slaves, you're a decent guy, so you won’t **** me. We live together already. Now we just get to add the really fun stuff.” She nips your chin, then pulls your head down and presses her lips to yours in a deep, wet kiss.

When your sister breaks off the kiss, she looks into your eyes and says, “I don’t want you to feel guilty about this. You didn’t mean for it to happen to me. But you really did want a fuck-****. Admit it. Now you've got one. And not to brag, but you've got one that probably knows a lot more about kinky shit than some high school girl." She nips the side of your neck. "And if you're still feeling bad about it being me, Stretch, I have to tell you, there’s a great big positive to this spell for me. I feel happier than I can ever remember feeling whenever I do something for you. And you turn me on like no other guy ever has. My pussy is practically gushing right now, and just kissing you gets me close to cumming.”

Your sister’s hand moves to the bulge tenting out your jeans. She rubs slowly up and down over it. Your stiff cock strains against her palm. Her eyes are half-lidded, and she moans when she feels your cock respond to her touch. “Now, are you sure I don’t have to give you that blowjob, little brother?” She asks in a teasing, alluring tone.