A/N This is my first time writing a threesome. If this isn't something you would normally read, then please move on to something more to your taste.
"Spread those legs darling" Severus whispers, running his hands over pale skin, slender finger dancing around a puckered hole. He teases the entrance, revelling in the shudder it causes.
Harry complies, arousal coursing through his veins, passion heating his skin. He wiggles his arse in invitation, giving a yelp when a firm hand smacks a cheek. Severus growls and deftly breaches Harry's hole with his finger. Crooking the digit he presses against the Gryffindor's prostate. Harry arches his back and mewls.
"Started without me?" A voice asks from somewhere near the door
"Sev was getting impatient" Harry says cheekily
"Impertinent brat" Severus hisses, biting down on the sensitive flesh of Harry's arse.
"Fuck!" Harry moans, his cock getting harder, pre cum dripping onto the bed cover
"You two make quite the picture" Tom says huskily "might stand here and enjoy the show"
Harry shakes his head vehemently at Tom's suggestion. He's been desperate for his Slytherins all day and simply won't settle for just one participant. "I need your cock baby, being dying for it all day"
"Such a slut for cock aren't you darling?" Severus purrs, swiping his tongue over Harry's hole
"Mmm" Harry replied breathily "love cock in my mouth, makes me so fucking hot"
Tom smirks; Harry can see his eyes darkening with lust and shivers. The Slytherin moves with stealth over to the bed, his clothing vanishing on the way. The Defence Professor licks his lips at the sight of Tom's long slender cock, standing proudly against his stomach. Harry groans as Tom gives it a tentative stroke, pre cum gathering around the head.
Tom rubs his cockhead over Harry's lips, the Gryffindor's tongue darts out to lick away the pearly beads of liquid, and his green eyes fixed on his lover.
"Open up love" Tom instructs, pushing his cock into Harry's willing mouth. Burying hands in messy raven locks, Tom thrusts gently into Harry's mouth.
"Sweet Merlin" Tom breathes, Harry is sucking and laving his prick just the way he likes it. The man was born to suck cock.
The sight of Harry sucking Tom's dick kicks Severus' arousal to its peak. Muttering the relevant spells, he enters Harry in one swift motion. The man moaning around the prick in his mouth at the intrusion.
Harry is in heaven. There is nothing he loves more than being filled with cock, and Slytherin cock at that. His lovers are inventive and passionate, accommodating Harry's every need. Not so long ago, Harry would have shied away from this sort of thing, but under Severus and Toms gentle care, he relishes in the intense intimacy and passion they share.
"That's it my beautiful slut, take my cock" Tom whispers, pushing his dick further into Harry's mouth. The Gryffindor sucks harder and palms Tom's heavy sacs in response. The tip of his penis hits the back of Harry's throat. He has learned to control his gag reflex and continues to lave the turgid flesh.
Severus increases his pace, snapping his hips forwards and pounding Harry's hole. His grasp onto Harry's hips to steady himself. Focusing on a spot on the wall to stave off his orgasm as Harry clenches his muscles around him.
"Touch yourself for me darling" Severus tells Harry, who shakes his head in response. The Headmaster smacks his arse hard, leaving a reddened handprint behind.
"Want to cum to sound of your voice" Harry mumbles around Toms cock. He loves the smoothness of his lover's voice. It's like velvet and dark chocolate. Liquid sex Tom calls it.
"You want to cum untouched, while I pound your arse, while you suck Toms cock?" Severus asks
Harry nods his ascent. Toms grips his head harder at the notion. He leans over and fondles Harry's nipples; they are a particularly sensitive part of his lion's body and the Slytherin relishes in the sounds teasing them illicit.
"Feel my cock in your arse darling, so tight, so wanting. I could lose myself for days fucking you. You love being filled from both ends don't you my little lion?"
Harry whimpers, his dick leaking profusely onto the duvet.
"Such a wicked, dirty boy wanting big cocks to fill him. Do you think about our cocks while you're teaching?"
Harry nods vigorously.
"I bet he rubs that pretty cock as he sits behind his desk, watching the students work" Tom interjects
"He spies too" Severus counters "uses that cloak, sneaks into the boys bathroom and watches them play with their little dicks, desperate for release. Little do they know that their filthy Defence Professor is spying on them"?
Harry whimpers around Toms cock, he has never been so aroused, so hard in his life. Severus' words only serve to make him hotter. He is every bit the filthy Professor his lover claims. He and Tom have wanked each other off in the bathrooms, while randy teenagers rut against each other or pleasure themselves.
"Can you feel your balls tightening?" Severus asks, grabbing Harry's sacs and squeezing them.
Harry moans his answer. There is a tingling sensation in his legs; he knows he won't last much longer.
"Are you nearly there love?" The headmaster asks Tom "ready to empty your hot seed into that sweet mouth, watch as he swallows every last drop"
"Fuck yes" Tom hisses, fucking Harry's mouth with abandon
"I love you my little lion, my little snake" Severus moans, snapping his hips forwards, his own release rapidly approaching. "Cum Harry" he grunts, "make that pretty cock cum"
The Gryffindor's body shudders as his orgasm crashes over him. He rides the waves of ecstasy, white ropes of cum spilling onto the bed covers. Tom cries out and cums in Harry's mouth, he swallows greedily, milking every last drop from the softening flesh. Severus thrusts deep into Harry's arse, stilling as he empties his seed into the abused arse.
Panting heavily, Harry feels bereft and empty as the flaccid penis' slip from his mouth and arse. Tom moves onto the bed, pulling Harry from his kneeling position and against his chest. Severus casts cleaning spells on them all and lies on Harry's other side. The Gryffindor's arms move over his waist. There are muttered I love you's and chaste kisses as the trio drift off into a sated sleep.
Each dreams of the future ahead and what it holds.