You tell Abbie the truth

You go to the top of the stairs and call down, “Hey Abs, could you come here? There’s something weird online I want to show you.”

Abbie practically comes running into your room. “Hey, Stretch, what is it? Nasty porn?” she asks, sounding excited.

You stand behind your desk chair turning it towards her. “Here, have a seat,” you tell her. Your heart is racing. It’s going to be harder telling Abbie about the spell than it was telling Tracey and Leah. She smiles wide at you, and as she comes closer to you, she trails her fingers lightly over your arm. The touch makes your cock begin to stir. That isn’t going to make talking to Abbie about this any easier. She settles down in the seat.

“You’ve probably been feeling, um, different today. Weird maybe? Thinking about me a lot” you say as you turn her to face the computer screen. You lean past her to bring up the window with the spell on it. She blushes at your closeness and inhales deeply, breathing in your scent. “It’s because, I, um, accidentally put a spell on you,” you mumble.

“What are you talking about, Beanpole?” Abbie laughs, “Are you a warlock now?”

“Just read the webpage. It has all the details. I didn’t mean to do this to you; it was an accident,” you reiterate. “The spell, it makes someone into, um, a sex ****. So you have to do anything I tell you. And, well, you’ve been thinking about me sexually all day, haven't you? Tell the truth.”

“I have, but that’s just because you’re so adorkable.” Abbie laughs, then she frowns as she reads, “Wait, is this real? How, could that be? Magic? It doesn’t make any sense.” She shakes her head, but keeps reading.

“Fuck! This can’t be true, but it explains why I’ve been thinking about nothing but fucking my own brother all day. If you really did this, you can do magic. Holy shit! That’s hot.” Then she sighed sounding relieved. “It also means I’m not a sexual deviant. You are. I’m just your victim. Oh, I like the sound of that, being your victim. Wanna victimize me some more?” Her voice dropped to a lower register, becoming throaty and sultry. She spread her legs wide apart. One hand lifted her short skirt and her fingers traced up and down over the crotch of her panties. Your stiff cock flexes at the sight.

“Abbie, I honestly didn’t mean to enchant you. It was a big mistake. You see, there it says if you don’t have a hair, it’s likely to affect the nearest person of the right gender. Something went wrong, I didn’t have the right hair. Or maybe one of your hairs got on my desk before I cast the spell. I don’t know.”

Your sister pouts, “Now I’m feeling, hmmm, not jealous exactly… curious. I wanna know who you were trying to turn into your fucktoy instead of me.” Then she squeals, “Oooh! Maybe I can help you get her. I’ve done threesomes before; I’ll make it so good for you.” She leans forward in the chair and her hands move to your belt buckle. “But until then, you’ve got me.” She giggles.

“Abbie,” you say in a hushed voice, “Mom is in the house, we can’t do anything here.”

She frowns, “Right. I should have remembered that. I can’t think of anything but getting your dick in me right now, though. Where are we gonna go then? You are gonna fuck me, right? I mean, you can’t make me feel this way and then not fuck me!” she said, her voice turning a little ****.

You nod. “I, I have to. The website says if you don’t get contact with me soon, you’ll become dangerously obsessed.”

Abbie shudders at that. “Dammit, I don’t see how I could be much more obsessed with you than I am right now, and I don’t want to find out what that’s like. Let’s just drive to the beach. You can fuck me in the backseat in the parking lot.”

You’re nervous about getting caught fucking your sister in public, that would cause a major scandal, and you're not sure it couldn’t get you both arrested. If you’re in jail, the girls will all go nuts. You shake your head. “Can you afford to pay for a motel? What about the place with hourly rates, out on the highway?”

Abbie grins and nods. “Oh yeah, taking me to the no-tell motel and making me pay for it. That's treating me like a slut, stud.” She gets up from the chair and grabs your hand, almost pulling you out of your room and dragging you down the stairs. “Mom! We’re not going dancing, I’m just taking Beanpole out for some ice cream. Want us to bring you any back?” Abbie calls out as she hustles you out the door.

“Ice cream? Now?” your mom replies, sounding confused. “No, I’m counting calories. Don’t be out late, Dave has school tomorrow,” she yells as the door closes behind you.

Almost as soon as she pulls out of the driveway, Abbie’s hand is on your crotch, stroking over the bulge in your jeans. “Holy fuck, things are starting to make sense now!” she exclaims. “That’s how you ended up with those two girls. Even though they were seeing each other. You did this to them. Beanpole, you’re a fucking horndog; it wasn’t enough for you to have two magically enslaved girls, you wanted another right away?” she snickers. “Just how big a harem am I going to be competing with for your attention?”

It’s weird trying to have a conversation with your sister while she’s grinding her hand over your hard-on, but you figure you should probably tell her how things got to this point. “It, just, all kind of snowballed, Abs,” you say. “The first time, I didn’t know the spell would actually work. I just did it for a laugh, or well honestly, 'cause I was getting off on fantasizing about Tracey being my ****. I also didn’t know she was gay and had a girlfriend.”

“Anyway, Tracey asked me to enchant Leah, so they could still be together,” your voice gets quieter as you continue in a mumble, “and because she heard me say something about getting turned on by a threesome with two girls, so then she really wanted to give that to me.”

Abbie’s hand squeezed your cock. “All you guys want that. Now you get a foursome, with a little extra **** spice added,” she cooed.

She drove for a while, continuing her slow stroking the whole time, before she spoke again. “But why did you want to add another girl so soon? Were your lesbian love-slaves getting boring after just one day? And who was it?”

Saying this part out loud is embarrassing, you hesitate for a long time before you get up the nerve to say, “Um… it was, ah, Tracey’s mom.”

Abbie burst out laughing. “Beanpole, you freak!” Her hand strokes faster. “So, I wasn’t wrong about you being into the whole **** thing. That’s encouraging.”

“It wasn’t just for that," you protest. You try to explain, "I couldn’t find a place to, you know, do it with the girls, and they need it, well, every day. Tracey and her mom live alone in a big house with lots of privacy, so I thought that would be a good place.” As the words leave your mouth, you can hear what a weak excuse it is.

“Poor you,” your sister smirks. “It was all a big mix-up, and now you have to take care of a fucking harem you never wanted,” she says sarcastically. “Well, I hope you have the stamina to keep us all satisfied, ‘cause right now, I feel like I could ride you all night long, and still want more.”

“About that,” you say, “it turns out there’s a magic spell for it.”

Abbie’s hand clenches harder on your cock. “Reeaaally? Tell me more,” she purrs.

By the time you’re done explaining the basics of the Blessing of Inuus spell, and mentioning some of the others you saw on the website, Abbie’s pulling into the motel parking lot. “Let’s put that magic to some good use, Stretch,” she teases you, giggling. She leans over to kiss you on the cheek and gives your cock a last squeeze before she gets out of the car. She jogs to the motel office to check in, then comes back to the car to lead you to the cheap motel room.