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Karkat's trying to mind his own business and Eridan has burst into his room with an obviously bullshit scheme to get Karkat to agree to having sex. It's hot, sticky troll sex that Eridan's desperate for.
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"Pleaaase?? You havve to believve me this is serious!"
"LISTEN TO ME. I KNOW YOU'RE FUCKING LYING BUT- UGH IT'S NOT LIKE I HAVE ANYTHING BETTER TO DO RIGHT NOW. WE CAN... FUCK..." Karkat sheepishly agrees to Eridan's dumb request
"Ha! I kneww you wwould fall for it. Such an easy mark!"
"WHATEVER MAN." He replies. "SO LIKE, ARE WE JUST DOING THIS HERE AND N-" Karkat's lame repsonse is interrupted by the sudden meeting of his lips with Eridan's. His eyes widen in anger, but the payoff to the sexual tension allows him to relax and close his eyes. All the work is done by their mouths while their arms lay awkwardly at their sides. Wet and sloppy make-out noises fill the room.
Karkat pulls away for a moment to pull his t-shirt over his head, avoiding Eridan's smug gaze which lowers from his own to his fatass chest. "W-WHAT?"
"Fatass."
"FUCK YOU," Karkat blushes stupidly "TAKE OFF YOURS, ASSHOLE, LET'S SEE YOUR GAY LITTLE NIPPLES"
Eridan complies and lifts his t-shirt to reveal a surprisingly (to Karkat) built chest. He says with raised eyebrow, "Like wwhat you see?"
Karkat can't help himself. He shifts closer to Eridan and latches onto his damn muscular chest. He sucks and slobbers on Eridans gay little nipple while staring intently into his eyes.
"Oh fuck... you little slut!" Eridan pleased with the reaction, grasps Karkat's hair and holds his head to his chest gently. "You like daddy's chest, hm?"
Karkat bolts upright angrily and points a finger into Eridan's once-smug face. "DO NOT EVER USE THAT HUMAN WORD!"
"Okay, troll-jesus!" Eridan apologetically whimpers.
Karkat leans into Eridan pushing him back onto the bed. He commands attention with his gaze while pulling Eridan's shorts down with one hand. "GOOD?" He asks.
Eridan nods. They stare into each other's eyes as Karkat's clumsy fingers reach Eridan's bulge. He wraps around his trollhood and lingers for a moment, feeling Eridan's warmth in the gayest way. His thumb snakes up to the tip and gives it a handshake that makes Eridan whimper. Karkat giggles.
"I DIDN'T EXPECT YOU TO BE SO PATHETIC IN BED." He teases. "WHERE'S YOUR POMPOUS MONOLOGUE."
"Y-your hand is around my bulge... what am I meant to say!"
"SAY PLEASE."
Eridan's eyes betray his indignance, but he suppresses his bitterness. "Please..."
Karkat gives Eridan a look of satisfaction and leans in for a kiss. He smoothly begins to work the bulge in his loose grip, his thumb teasing the tip with each stroke.
Not one to be trumped, Eridan grasps at Karkat's back and hair. His hands explore each inch of the large body that lay over him and he eagerly smooches Karkat's soft lips - faggy lips if you ask him. Before today, Eridan hadn't considered Karkat beyond his rather ugly (and gay) face and personality. He found Karkat to be rude, loud and not to mention, unnatural. However from this angle, what seemed like a sweaty loser on all-fours softened. Maybe it was okay that his eyes were too far apart, and his hair was never conditioned, that he low-key stunk of pee and that he couldn't even eat face without slurping. His domineering of the situation right now was pretty hot...
Karkat pulls away from Eridan to tear off his own pants. With an inaudible boing, his smaller bulge is revealed. Immediately the two bulges wriggle their way towards each other, coming together with a slick slap. They both moan instinctively which drives them to kiss as if magnets were implanted in their lips. The bed creaks as they both buck their hips and the pair become driven by the whims of their frotting opposable tentabulges. With minds of their own the tentacles writhe and knot with each other, aided by the generous lubrication provided by their troll anatomy.
"Holy fuck... Karkat... I'm FUCKIN close" Eridan mumbles, interrupted by a sudden jolt of pleasure. "D-do wwe get the bucket?"
Karkat bursts into laughter mid-kiss, spraying spit into Eirdan's open mouth. "YOU FUCKING IDIOT." he chuckles.
They stop grinding to giggle into each other and they end up smiling softly, staring. Karkat breaks the moment by slapping Eridan's non-existent ass. "YOUR DUMB ASS MAKES ME WANT TO DO IT HUMAN-STYLE" he slowly presses his mouth to Eridan's ear, "I WANT TO FINISH INSIDE YOU"
Eridan's body tenses, and his face flushes violet.
"M-mhm." is all he can manage to say before he's pushed onto his stomach, ass over the bed. Karkat maneuvers behind Eridan and presses his bulge against the cheeks presented to him. The cold slime sends jolts into Eridan which cause him to hump the bed suddenly.
"Aha... You knoww, I'm not sure about this anymore, Karkat! I'vve never done somethin like this... like, no-ones been in there before."
"SHUT UP DIPSHIT" Karkat replies, his gaze transfixed on Eridan's tight bulge-hole. He leans over to grab Eridans wrists with one hand and lifts him from kissing the bed. Eridan looked so hot it made Karkat want to drool. This dipshit's made his life so difficult, and he's gonna get his revenge. Karkat never wanted Eridan so carnally as in this moment.
He probes Eridan's troll-pussy with the tip of his bulge, feeling his slick entrance pulsate and drool. The teasing makes Eridan whimper as he tries to look backwards to his own ass.
"I'M... GONNA PUT IT IN." Karkat states dumbly.
Eridan nods and closes his eyes, prepared for whatever feeling would come next. Of course, he's toyed with his pussy before, but fingers and toys surely couldn't come close to a real tentabulge, right?
Karkat pushes his bulge into Eridan, but it angles away and brushes Eridan's dangling bulge.
"F-fuck!" Eridan scrunches up his face with the unexpected friction.
"HOLD ON." He gives it another shot, pushes more gently. Karkat's tentacle slithers its way into Eridan's pussy, causing them both to moan with intense pleasure. It's a glorious union of morons. Record this in your history books folks, two sweaty incels finally take a look at each other and realise what they could've been doing this whole time. Gasps and moans fill the room as well as 'plaps' of which the gods would be jealous. Karkat picks up the pace while Eridan is dangled by his wrists, which forces him to cooperate with each thrust.
"Troll-jesus Christ!" he gasps as Karkat hits his troll g-spot "this-feels-so-fuckin-gooood"
Karkat dutifully keeps rhythm but tired, he releases Eridan's wrists suddenly, he's not that fucking strong. Eridan collapses onto his face, squishing his cheek cutely but the position allows more access to his g-spot and the pleasure jolts him upwards. He holds himself up with his arms lest he be assaulted by the immense feeling again. Were anyone to come into the room right now, to see Eridan bent over the bed being fucked in his troll-pussy by Karkat of all people, he would never live it down.
"IM SPLOODGING IM SPLOODGING FUCK FUCK" Karkat screamed embarrassingly as he finally reached climax.
"Mmmh, fill me Karkat, goo me up in my tight pussy." The warm feeling of being filled with Karkat's slime sends Eridan to climax at the same time, and he releases onto the edge of the bed and the floor. Karkat tenses firmly as he surrenders every last drop to Eridan's warmth.
Once its over they pant in unison and Karkat flops over onto Eridan's back, bulge still securely inside.
"FUCK, SORRY. I THINK I NEED TO JUST... LIE HERE FOR A MINUTE"
Eridan responds only by sighing heavily, squished by Karkat's sizeable body.