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The level of desire for Krill that Mo has is something that regularly confuses Krill. When did Mo get so devout? Why does he want Krill so bad, anyway? What did Krill do to deserve such affection?
Krill might never get the answers to these questions, but it does mean that Mo's neediness is far above what his stamina and ability, but even the thought fuels Mo.
"Easy, baby. Don't spoil yourself yet."
Krill's voice alone makes Mo struggle to focus, shifting his paw a bit to line up better. Krill told him that penetrative sex was off the table today, so a last minute compromise - Krill would tell him every little thing he'd do one day, and watch Mo edge himself off the sweet thoughts such promises brought. This was its own kind of scene, one could argue - running the curved part of his claws up and down his cock, slick with precum, tensing as he tries to do what Krill tells him between the fantasies.
Krill convinced him to change it up. To think about Krill under him, needy and desperate, and fuck his paw like it - remember how good rut felt when it settled in his head and he pushes without fully giving in.
Mo can't keep his head up, leaning forwards against the bed, for Krill's lap to catch him. He can smell it - Krill's wet, but frustratingly close, and he wants it. He wants to lavish Krill's pussy in attention, let go and cum from just the taste of Krill alone, but Krill's adjusted - his nose is close, but not close enough to touch. He'd cum from the smell if Krill would let him.
"Be a good boy, Momo. Not yet." Krill coos, settling one arm around his neck. "You're so cute like this, you know? If I could keep up, I'd want you like this all the time."
Mo's cock twitches against his palm.
"Go on, honey. You've been such a good boy, thrust into your paw. Think of me."
Like he would think of anyone else.
Mo tenses, tail violently wagging. Helplessly, he thrusts into his paw like he was told to, thinking about if it was Krill's hands, or even his mouth. The scent drives him wild, and Mo's so very quickly losing control, humping his paw vigorously.
"Slow down, honey. Not yet." Krill mutters, and Mo lets out a whine as he obeys. His cock throbs, and he attempts to hold back.
"Good boy. Such a good boy, Momo... you're always so good. Do you still smell what you do to me? You're such a good boy, maybe I should reward you..."
God, if he had a voice. There's not enough begging and pleading he could do to ask for his nose against Krill's cunt. Without thinking, he's back to his previous pace, the rough slap of his hips against his paw and the quiet whine the only noises he can make.
"Slow down, Momo. Don't push too much."
A whine leaves Mo's throat as he forces himself to slow down again. Please, please, please... he needs it. Krill shifts, oh so slightly, and Mo doesn't hesitate to push his wet nose against Krill's dick and inhale. It gets a chuckle out of Krill.
"Good boy... you can smell me, right? Smell what you do to me?" Krill coos, and Mo can't help it - his mouth is open, drooling, tongue not long enough to reach past his snout. He needs more. Please, please, more.
"Mm... maybe I'm being too cruel. You want me to cum, don't you, baby? You've been such a good boy..." Mo rubs his nose against Krill's dick, earning a gasp.
"... okay, honey. Let me just..." Krill rocks against Mo's snout, and Mo feels his eyes water. So close. So close, and he's unable to move, outside of pathetically hump his paw.
"A-ah, Momo, slow down -" this command's lost as Mo finally reaches the end of his patience, forcefully nudging his nose against Krill's dick again. His other arm reaches up, no longer keeping his balance as he drags Krill into range of his mouth. Without a second thought, Mo's tongue is pressed against Krill's dick, eager to taste as much as smell, and he continues to hump his paw. So, so close...
"M-Maurice, wait-!"
Mid swipe of his tongue, Mo freezes, and Krill lightly pushes him back up to sitting. Mo does so, but not without whining.
Krill adjusts, sitting up and settling against Mo. Mo almost cums from the feeling of Krill's cock pressed against his own - he can feel how wet Krill is, almost as much as he was earlier, if not more. It's taking all his restraint to not just fuck Krill into the bed until he can't think anymore.
"There you go, honey." Krill reassures, testing his hips. He can handle frotting. "You've been such a good boy, you know that? So good, that I'm going to let you make me smell like you."
That alone has Mo tensing. He's not going to last, thinking way too hard about all that beautiful, wiry fur splattered with cum, and more importantly, the smell of Mo and only Mo. He's drooling even more, not even hiding what this does to him.
"Okay, okay. You can go n-"
Krill barely gets the words out before Mo's practically knocked Krill over, rutting his cock against Krill's as he so violently chases that need. Krill squeaks when he falls on his back, eyes wide as Mo makes an effort to not crush Krill under him. It's barely a minute before Mo finally, finally cums, spilling white all over Krill's dark fur. The change of smell is instant and Mo doesn't stop thrusting, listening for the sounds of Krill's gasp to indicate he's hit his limit.
Krill is about to say something, but Mo's sat back up, claws tender but firm as Krill's plopped in his lap. Mo doesn't press into Krill, instead content to rest his dick between Krill's asscheeks.
"... I did say you could..."
Krill holds onto Mo's paws as he eased up and down, with Mo eager to coat more of Krill in the only smell he needs to have. Mo still has an entire other side of Krill to mark as his - and with how much he's been teased, he wants to cum down Krill's throat, too. The thoughts are building again and Mo speeds up, with Krill watching quietly.
Mo knows damn well Krill will want a bath and ruin all his hard work, but for now... for now, he's happy to know Krill is going to reek of him, and no one can take that away from him.