A little supplemental chapter. The reviews warmed my heart.

"Marshall I'm serious, I have to go. If I fail another test I'm screwed."

I try very hard to ignore the fact that the Devil himself is literally trying to coax me away from doing something valuable with my time. I'll start laughing at the irony, and any laugh that comes out of me right now will sound more like a choked moan. He's standing behind me, kissing my neck softly, and has his arms wrapped around me, his fingers toying with my hip bones.

"But I want you," he whines pitifully. Some king of darkness and evil he turned out to be.

I scoff. "You've been alive for thousands of years and you still haven't figured out the most obvious truth to living? Newsflash. You don't always get what you want. And besides. You only have to wait a couple of hours. Then you've got me all to yourself."

"But-!"

"No buts. I really gotta go! If I'm late PB will skewer me alive! And it's not like I want to. I only need help in Algebra, but if I don't stay for English tutoring PB gets pissy for extending extra effort only for Phoebe. They had some sort of falling out or something... I don't know. I should be back by ten."

He sighs, removes himself from me, and plops down on on my bed. He'd started showing up at my place when he knew my older sister Cake, who looks after me, wouldn't be home. He'd said the change of scenery was nice.

"Fine," he says. "I'll just wait and suffer." He pouts like a five year old, and one of his sharp canines sticks out as he does.

"Good. I'll be back soon."

0o0o0

"So the systems of quadratic equations can be solved by using the quadratic formula to- Fionna are you even listening?!" PB's voice breaks the sound barrier, and my head snaps up. I don't know if I've been sleeping or just that far zoned out. Math has never been my strong suit. And the library chairs are making my butt numb.

"Yeah! Yeah!" I say. "Systems of equations!"

She raises a pink eyebrow. Honestly, it's one thing to dye your hair pink, but dying your eyebrows the same shade is a bit excessive.

"Oh really," she says. "Systems of what kind of equations?"

"Quadratic?" Please let me be right please let me be right please let me be right.

She nods her head, and I think I'm in the clear, but she says, "And since you've obviously been paying attention, how do you solve the system of a quadratic equation?"

I start sweating bullets. "Um... Um..."

Phoebe, who has been silent thus far, shoves PB lightly and says, "Oh lay off her. You didn't even explain that part."

Phoebe to the rescue. I shoot her a grateful look, and she sends back a nonchalant thumbs-up under the table.

PB looks at her uncomfortably, and shifts in her seat. "Right, anyway, to solve the systems of quadratic equations..."

I lose myself in the practice math problems. Once we've gone over what PB deems enough chapters and looks over my work and concludes that I should at least score and eighty-six, we move on to English. I only stay out of obligation, since I actually do pretty well in that class, and it's probably only ten seconds in before I realize I'm bored out of my fucking mind.

Luckily, I don't have to stay long.

I feel him before I see him. He has a dark aura, which I find funny. He's not really all that intimidating.

Marshall's hands are suddenly on my shoulders. He leans down, kisses my temple, looks up, and says, "Ladies."

PB and Phoebe jump in surprise.

"Who are you?" PB asks.

I can hear the smirk in his voice as he says, "I'm a... friend of Fionna's. She told me to pick her up at ten. It's a quarter to eleven, and she didn't come outside. I wanted to make sure she was okay. Here I am."

Impatient bastard...

"Shit, is it really that late?!" Phoebe exclaims. "I gotta jet. See you later Fionna... Peebles." She gathers up her stuff in a hurry and rushes off.

PB looks petulant at not getting to finish her women-of-classic-literature lecture, but says, "I guess I should go too. See you tomorrow. Oh, and by the way Fionna, I can see why you've been skipping out," her eyes are appraising Marshall, "But come on. The Devil. That's just weak."

Marshall raises an eyebrow. "You told her?"

I shrug. It's not like she believes me, and I didn't think she would, since she's all madame scientific research and shit.

She gathers her stuff as well, and I stand up and start to head out, but Marshall catches me by the wrist and whispers "Wait." with a cheeky grin on his face. He snaps his fingers, and the lights shut off. He snaps them again, and when the lights come back on, all the desks are stacked precariously on top of the excessively high bookshelves. We're lucky everyone else in the library has left for the night, and we're in an annex room away from the librarian.

PB stares at him in awe for a moment, but clears her throat and says, "I'm sure there's a completely logical explanation. Though I will admit that your boy toy is one hell of a magician. Fionna, I bid you goodnight."

Once she leaves, we bust out laughing until we're breathless.

"Oh man," I say once I've stopped gasping for air, "You actually made her doubt herself for a second. Now that's impressive."

He chuckles and says, "So can we get out of here now? You're beyond late."

I roll my eyes and walk out with him. Once we're outside, he says, "You know, I don't think I can wait."

"I live literally two blocks from here, and you could just snap your fingers you know."

"Well yeah, but where's the fun in that? Come on." He takes my hand and drags me down the dimly lit street. He pulls me into the first alley he sees, and the second we're shrouded in shadows, he slams me against the wall and kisses me roughly.

I reach up and grip his hair, tugging it hard. He hisses at me, but it's not exactly a hacked-off kind of hiss. He breaks the kiss and brings his lips to my jaw. His hand finds its way between my legs, and he strokes me gently. He breaks off and looks at me in surprise. "No panties?" he says.

I shrug innocently. "I figured you wouldn't be in the bullshit around kind of mood."

He flashes a crooked grin and says, "In that, dear Fionna, you are very correct." He continues his stroking, rubbing my clit in circles with his thumb. He pushes his remaining fingers inside of me and pumps them quickly, curling them every once in a while. I have to bite down on his shoulder to keep from crying out because holy shit. It feels beyond good. I feel like I could run a marathon, which is bogus because I'm pretty sure my legs are trembling. No. Not trembling. Trembling is for the weak. Shaking? No. Convulsing? Yeah, convulsing. That's a little better.

And I'm so close. I'm so close I can practically taste it, when I hear a shrill, yet familiar voice yell, "HEY! You can't do that out here!"

I try to spring away from him, but of course, the Devil has no shame, and keeps holding onto me, stroking me, and honestly, I stop caring about whoever's watching. So, despite our onlooker's protest, I bite deep into Marshall's shoulder and come on his fingers.

He withdraws his hand, and licks the wetness off of his fingers slowly, giving me a knowing look. Finally, the onlooker has had enough and marches over there and says, "Look, I don't know who in the hell you think you are, but you can't just have sex in the middle of- oh, well hello there."

God that voice is familiar. I turn so I'm hiding behind Marshall's form. I don't need anyone I know seeing me like this, and I'm suddenly thankful that he's so much bigger than me. I catch a glimpse of the source of the voice when I shift my position though, and-

Oh shit. That's why the voice was familiar. It belongs to my sister, Cake. I try and shrink myself and stay even further out of sight.

"Hello ma'am," Marshall says smoothly. "I apologize for the indecency. It seems that we simply can't keep our hands off each other. But we're finished here, and won't be continuing such an activity in this setting, so please, continue with the rest of your evening."

"I-I," she stammers. Oh. He's working the demon charm. Well played. Please work, please work... "Sure. Just... Just don't let me catch that again. My baby sister comes to this library all the time. I don't need the likes of you corrupting her." I try very hard not to snort as she walks away indignantly, hips swaying.

When she's gone, I breathe a sigh of relief and look at Marshall and say, "Come on, I gotta get home before she does."

He nods, and raises his hand to snap his fingers, but as he does he says, smirking, "Just remember, after she's asleep, you know the rules. Eye for an eye."

I smirk back. "You got it."