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"Look at you," you coo, your tone bordering on teasing as you straddle Shawn's bare thighs. "You look so pretty like this, sweetheart," you hum as you gently rake your nails down his stomach, "blushing and so hard for me."
Shawn's fingers grip tightly at the sheets as he resists the urge to reach out and grip your hips. He watches, his eyes blown wide with lust, as your hands stop at his hips and your fingers ghost over the sharp v-lines. "'M'always hard for you, babe," he breathes as your nails rake through the dusting of hair leading to his cock, "so fucking hard for you."
You hum your acknowledgement as you drag your fingers just a little lower, dangerously close to his cock, and you can feel Shawn tense beneath you as he waits for you to touch him exactly where he wants you. You can see the pre-cum leaking from his tip, can feel how tense his entire body is from the teasing you've put him through over the course of the night, and you know that he's already on edge without you so much as touching his cock. You know that the moment you do, it'll be over.
And you're not quite ready for that yet.
When you bypass his cock to grip his thighs, a whine spills past his lips as he bucks his hips. "Please, babe," he breathes, his voice thoroughly wrecked, "please, just touch me."
"Behave," you hum as you lean over to press a kiss to his flushed chest, "and I will." You glance up at his face from beneath your lashes and bite the inside of your cheek to keep from smiling at the adorable pout gracing his lips. "Stop pouting," you breathe against his skin as your lips ghost over the deep purple bruise you'd left on his chest what feels like hours ago. "Good boys don't pout."
You still for a moment, your lips barely touching his skin, as you feel him relax beneath your touch. A small smile quirks the corners of your lips as you return your lips to his skin to pepper soft kisses across the expanse of his stomach. His fingers are desperate to tangle in your hair, he wants nothing more than to just guide your lips onto his cock and get some sort of release, but he wouldn't trade the feeling of your lips brushing the faint scar by his hip and your fingers gripping his thighs for the world. And he knows that if he listens, lets you play, he'll get exactly what he wants and then some in the end.
But the moment that you shift further down his thighs and into a more comfortable position, Shawn's mind goes blank and his breath hitches in his throat in anticipation. He watches, his lip clenched tight between his teeth, as you move your hand from his thigh to his cock. When your finger brushes the tip of his cock and gathers a bit of pre-cum, his eyes clench shut and a breath he hadn't realized he was holding rushes past his lips. It's a struggle not to buck his hips in search of more, of something to relieve the ache that's been building over the course of the night, but when he holds himself still, he's rewarded handsomely.
Your tongue traces the vein running along the underside of his cock, from the base to the tip, before you swirl your tongue around the tip. Shawn fears, fleetingly, that he's going to tear a hole in the sheet as his fingers grip the material but he can't bring himself to care as your mouth wraps around the head of his cock. When he feels you begin to suck, he realizes that the world could end around the two of you and he wouldn't really care.
As long as he can feel you, feel your mouth wrapped around him, nothing else matters.
Following that thought, you take as much of him into your mouth as you can and Shawn is almost embarrassed at how close he is. Your hand grips the base of his cock and pumps what you can't reach in time with your mouth as you begin to hum around him. You can feel his thighs tensing beneath you and the moans are freely spilling past his lips at this point but he doesn't break until you move your hand from his thigh and roll his balls in your palm.
Shawn falls over the edge with a cry of your name as his head falls back into the mound of pillows adorning your bed. You swallow his release before you climb off of his thighs and move to sit beside him.
"Are you okay, baby?" you question as you brush the sweat-soaked curls from his forehead and take in the sight of his flushed skin.
"'M'good," he breathes, his chest still heaving as he attempts to catch his breath, "fuck, so good, babe. I love you."
"I love you, too," you laugh as you lean over to press a chaste kiss to his shoulder. "I'll be right back. I'm gonna go get us both some water," you inform him as you move off of the bed and make your way across the room.
"Hurry back," Shawn calls as you step into the hall. "'M'gonna return the favor!"
You groan at the thought of his head between your thighs and, with a grin on your lips, rush down the hall to grab water from the kitchen. It's going to be a long night and you really can't wait.

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Shawn Mendes Smut :)
Fanfictionif you don't know what smut is, you probably shouldn't be reading this.