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Help me with my Calculus, step-bro?

The move-in with my step-family was hard enough, but having to have my room next to step-brothers? It kind of made doing my calculus homework impossible. He blasted his metal music for hours every night, all while testing out his new drum-kit. No-one else in the house complained, because they didn't need to. All of them were downstairs, and didn't have to hear a thing. We were all alone upstairs, with me trying to pass my classes and Kallen trying to kill my ear-drums. With a growl of frustration and a thrash of my brown tail, I decided enough was enough.

With a small growl I bashed on his door, to little avail. The drums were too damn loud. So I opened the door, ready to yell my head off, but - he was crazy into it. So enwrapped in his drumming, he didn't notice me for a damn second. I'd never seen a little white fox like him look so big, so...

His ears flopped back and forth along with his golden ring piercing, his tail waving about as he went. It was weird, as an Australian Kelpie I was by far much taller than him, thinking I could intimidate him out of playing so loudly. But seeing him like this made me second guess myself.

As I backed out, anger fizzling out he noticed me at the last minute. His glare quickly melted into a quick look of curiosity, but I slammed the door shut. I hadn't seen him like that before, looking...actually looking kind of hot. There was an odd twitch, followed by a flush of heat beneath my fur. I'd neglected a shirt, thinking I was going to bed soon, but rolled my basket-ball shorts up and brushed off the feeling with a cough.

And with that, I went back to my room with the vain hope of finishing my calculus homework. And yet, the second I sat back down the itch came back. And the itch quickly became a tickle, one that right down my chest, my belly and right to my crotch. I tried to ignore it. I held onto my pen harder and bounced my leg in an attempt to distract myself. But I couldn't help but think...his short shorts, the energy and power he gave off as he thundered away on the drums. I just couldn't get it out of my head.

My imagination was quick to take over. His tight ass underneath those black shorts, how sweet his moans would sound in my ear...how easy he would bounce on top of my throbbing cock. My dick was quick to harden, despite my mind weakly urging me to think something else.

Anything else.

But it was too late. Too late for me to do anything about how good my dick felt right now. Slowly, bogged down in hesitation I reached beneath the waist-band of my shorts and started to stroke my cock, my fingers tracing up and down the thick veins. The heat and itch of my body traced up and down my entire body, leaving me to shake in excitement as my strokes became faster and faster. As my strokes became faster my cock twitched more and more, the vision of his ass bouncing on top of me growing more and more vivid, his groans growing louder until -

The creak of my door opening snapped me out of it, ears folding back in my panic. I'd forgotten to close my door. Oh shit.

And there he was. Kallen, with his piercing, black shorts pulled up tight around him, his band T nearly just as tight, stood there in the doorway. Looking me up and down. There was a deep hunger in his eyes. Something I hadn't seen before.

His tongue rolled out, licking his lips with a swish of his long tail. A kind of hunger I had never seen in his eyes before.

'I stopped playing,' He said softly, cocking his head to the side. His eyes pawed down me, right down to my cock. It twitched under his gaze, a gaze that burned so bright that it began to leak pre-cum.

'Yeah, you did...' I murmured, daring to keep stroking myself in front of him. The hunger grew fiercer and he stalked towards me.

'Sorry about the ah, the loudness. I saw you come in before...and I just thought I could pay you back for messing up your maths homework, step-bro,' Kallen said with a small smirk he tried in vain to hide. Crossing the threshold, he let his hips sway, tail swishing this way and that.

'Pay me...back?' I said, taking in a deep, ragged breath. He folded down onto his knees, jaws open, his blue eyes wide and wanting. Kellen's breath hot and heavy against my cock, he slipped his warm mouth over the head of my penis. I trembled at the feel of his wet tongue and mouth pressed against my head, letting slip a moan so loud I feared downstairs would hear it.

But he kept going, and my moans kept getting louder and louder and I simply didn't care. Faster and faster, his mouth hot and wet and tight around my cock.

So, so good that I couldn't help it -

I pushed him away. Hot, heavy and panting I forced him look at me. I pushed my cock forward, hips thrusted up.

'Get on,' I growled, bucking upwards. Kellen let out a small gasp, scared but clearly eager. The heat in my crotch that raced all up my belly? That told me that my step-brother and his tight ass didn't have a choice. With two fingers of Vaseline on my fingers I pulled down those tight shorts of his and shoved those fingers into his tight ass, getting him nice and ready for my throbbing cock. With a sharp yelp, my big paws wrapped around his waist and slammed him down onto my dick, and began to bounce him up and down.

Kellen moaned like the tight bitch he was with every bounce, more than happy to have his ass slap against my well-muscled, thick thighs.

'Louder!' I snapped in his ear, thrusting harder and harder, so that he bounced higher and harder. And he obeyed. So loud that to our panic a set of footsteps thundered upstairs. Whoever it was, bashed on the door, asking to see if the two of us were okay. Shit. It was Kellen's dad. I pressed a paw over Kellen's snout, muffling the moans he couldn't help but let out.

'Uh yeah...Kellen is just watching a horror movie in my room, helping with my uh calculus homework -' I said with a grunt, realising how badly I needed to keep pumping into Kellen. After half a second of the sound of his Dad leaving back down the stairs, I picked up Kellen like he weighed nothing and slammed him back down onto the desk, ass high up in the air. Tail hooked over his back, legs dangling over the desk I grabbed his hips and went to town.

'You're my drummer bitch, aren't you?' I growled, pumping harder and harder, faster and faster. Kellen could only reply with a wild moan that resembled yes.

With a snarl on my lips and pressed heavy into his tight ass, I gave my final, massive thrust and came, deep as I could inside him. I noticed a faint drip of Kellen's own cum, leaking off the desk.

All over my calculus homework.

I leant down and gave a gentle lick to the back of his warm neck. 'Thanks for the help.'

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