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"Are sure about this? I'll probably get your seat messy." Noah hedged. They were parked in the alley behind Noah's place. It was just dark enough out that Noah was confident his neighbors couldn't see into Mirage's windows.
"Don't worry about it." Mirage groaned. "Come on, man, we can just hose me out later."
"Okay, okay." Noah huffed. He shoved his pants down just enough to expose his pre-lubed hole to the warm pseudo-leather of Mirage's front seat.
"Fuck yes." Mirage hissed, and then the seat was shifting under him, the bottom section separating from the seat-back and sliding forward a few inches, and Noah could feel Mirage's slick "spike" beginning to poke at his rear.
"Oh!" Noah gasped, he shifted back, his legs kicking out straight until his shins were knocking the dashboard's underside. He was trying to line up his hole better with Mirage's warm metal cock.
Then, Mirage was sliding into him even as his large cock continued to fill and extend into Noah's hole.
"Oh God." Noah dropped his head onto Mirage's steering wheel. Mirage was always a lot to take, but in all of their previous encounters – stolen moments tucked away in abandoned warehouses and empty garages – he'd been in humanoid form, and Noah had been able to control how fast he sank down on Mirage's fully "hard" dick. Like this, it was almost like he was pinned, Mirage pushing into him as his cock slid out from its confines – where ever it was Mirage kept the thing when he wasn't using it to drive Noah insane.
"Yeah." Mirage rumbled around him. "I always forget how tight you are, even without calipers. Fuck, man, like how do you even do that?"
Noah only groaned in response and rocked on Mirage's cock as it kept growing.
"You're gonna split me open." Noah whimpered.
"Huh? Nah, man. Hey, Noah, it's cool, you've taken all of my spike before, you can take it now." There was just the smallest edge of panic in Mirage's voice.
Noah shivered and ground back on Mirage's cock, which just kept coming. He tried to remind himself he had taken all of Mirage before, been split open on him before. His thoughts were interrupted by pleasure as one of the little dips and ridges in the plating on Mirage's dick caught briefly on Noah's rim.
"Oh my God." Noah slurred. He was still panting onto Mirage's steering wheel.
"Shit, dude. What can I do to help? I can't– I can't stop my spike from extending all the way now – you feel too good – but I can… I don't know, I can do something."
Noah bit his lip to stifle a moan. "Can you, fuck dude, drive us somewhere else, anywhere else. I can't do this outside my little brother's window."
"Oh Primus. Yeah, yeah, I can do that." Mirage gasped and then he was shifting into gear, the natural rumble of his body shifting into higher gear with it and rolling into Noah's body right through Mirage's cock.
Noah choked and stuffed his fist into his mouth to muffle his scream. Holy fuck, that felt so good.
He was jolted as Mirage exited the alley, the little dip at the curb onto Noah's street rocked through them both, and rocked Mirage's cock right into Noah's prostate in the process.
The delicious torture didn't stop as they hit the main roads, Mirage kicking into a higher gear – a smoother rumble to the vibrations in his engine, but every little bump in the road felt twice as deep.
"I think–" Mirage's voice crackled with unexpected static as he pulled up to the red light. "I think my spike's probably completely extended now."
Noah pulled his fist out of his mouth to answer, trying to straighten up in his seat at the same time, but all that came out of his mouth was a low moan. Holy fuck, he was so full. How did he always manage to forget how much Mirage filled him?
"I'm gonna die." Noah whimpered.
"Really?" Mirage squeaked.
"No." Noah managed. "Just feels really good."
"Oh." Mirage shuddered around him as he relaxed. "That's good. Just like, lay back, I guess? I'll take us to like… That spot humans kiss at in their cars, what's it called?"
Mirage lowered Noah's seat back as he spoke, toppling Noah back involuntarily. Noah gasped and shuddered as the motion shifted him on Mirage's spike. He could feel Mirage's cock shifting in his guts. And now it was putting constant pressure on his prostate. Oh fuck.
Noah whimpered. Mirage accelerated through the green light.
Noah managed to drag a hand up to his abdomen, and holy fuck – he couldn't actually feel Mirage's cock through his skin could he? Sure, Mirage was long (and thick) enough, but that didn't, that wasn't like, a thing that actually happened in real life. That shouldn't be a thing human bodies could do, right?
They hit a pot hole, and Noah could feel Mirage's cock shift under his hand.
"I might cum." Noah gasped.
"Oh?" Mirage replied, "That's cool. That's definitely good, man. I thought you might have to like, fuck yourself on me or something? But like, this does feel nice, dude."
Oh right. Noah should probably be trying to get his alien boyfriend off too. He clenched experimentally – he was never quite sure how much Mirage could feel through his metal dick – but all he really did was made his hole ache and spasm, spread too wide for comfort. Noah whimpered and breathed through the pain until he could force his lower muscles to relax again. His cock was still rock hard.
Noah shifted a little, going for a rotating grind and Mirage's cock – still humming with the vibrations of his engine – wavered inside him, shift his guts. Noah gasped, it was weird, a diffuse pleasure, and it was also unbelievably good. He was going to cum immediately if he kept that up.
Noah braced his feet on the floor boards, and shifted his grip on Mirage's door and center console for better leverage. He pushed himself up and back, Mirage's cock inching out of him. He didn't so much thrust back down as half slip when Mirage took a turn, but the effect was the same. Noah bit his lip to stop himself from making another embarrassing noise. Even with the sudden drop, the motion felt great. Unfortunately, Noah was pretty sure his arms AND legs would give out if he tried to keep that up.
They hit another pothole and Noah lost the battle to keel silent, his prostate sparking at the jolt while his whole lower abdomen hummed.
"Sorry." Mirage hissed. "I'm trying to avoid the potholes, I swear. You just feel really good, it's a bit distracting."
"I'm gonna stop moving now." Noah decided, his voice came out horribly breathy.
"Nooooo." Mirage grumbled. "It's fine, I can focus."
"No driving while…" Noah heaved a desperate breath, and cast around for a passable term. "Fucking? Having weird sort of sex where, where uh, no one moves?"
"I think it's called cockwarming. But dude, my visual processor is like a million times faster than a humans. I can drive while literally asleep."
"You shouldn't do that." Noah slurred. "Falling asleep at the while is bad."
"Ugghhhhh, fiinne." Mirage grumbled. "We're basically almost there anyways."
"Thank fuck." Noah breathed. He tried to focus on just staying a float in the waves of pleasure.
He jolted when Mirage finally pulled to a stop at the lookout and threw himself in park.
"Okay, full attention on Noah now. And may I say, you feel Primus-damned fucking amazing." Mirage rambled.
"Thanks, I think." Noah bit his lip. With Mirage in park, the rumbling of his engine was a bit more manageable, not quite so overwhelming as is vibrated into his body.
"I think I can maybe ride you now?" Noah offered. He shifted a bit and oh yeah that felt really fucking good. Noah moaned.
Mirage laughed, shaking through Noah's core. "C'mon ride me then. I wanna feel your sweet little valve rubbing me off."
Noah braced himself, and finally managed to properly lift up, a few inches of Mirage's dick slipping out of him. "Isn't valve like, your guy's word for vagina?"
"Uhhhh, what's a vagina again?" Mirage asked.
Noah's arms gave out and he dropped back down on Mirage's dick before he could manage an answer.
"Fuck." Mirage moaned. "Never mind, I don't care, you feel so fucking good, man."
"Yeah." Noah panted. He lifted up again, trying to use his hips and core more than his arms this time.
Unfortunately, Mirage was currently in his core.
Noah's hips slammed back down. Mirage moaned.
Noah panted, trying to catch his breath as sparks danced across his vision.
"I'm gonna cum, dude."
"Yeah, oh fuck. Do it, dude, cum around me." Mirage said, his voice crackling.
Noah didn't bother going for his dick, he just started rocking his hips on Mirage's cock instead – largely ineffectual little twitches that were nonetheless flooding his entire lower half with pleasure.
He came with a full body shudder, a breathless moan, and his dick still trapped in his sweatpants.
"Primus, fuck. Holy fuck, Primus." Mirage was moaning. "How do you even clamp down like that? Fuck, I'm gonna cum too."
Noah tried to keep clenching down around him in encouragement, and then he could feel the thick too-warm spill of Mirage's cock inside him, and he couldn't control his post-orgasm muscles at all.
Noah whimpered, his already stuffed-full lower half growing even fuller as Mirage continued to cum. He broke into a sob, and pressed a palm to his belly, his other hand clinging to Mirage's handbrake. He really was rounder, holy fuck.
"Primus and all the Primes." Mirage moaned. "Noah, fuck. I swear, you always feel so good! Primus."
Noah whimpered.
"Oh shit. Noah, you good? My spike'll start depressurizing soon, fuck." Mirage sounded panicked.
"'Mm good." Noah breathed. "Fuck, you just fill me so much. I'm fine, I think, just yeah, depressurize, yeah. Pull out and I'll be fine."
"Yeah, okay, cool, cool. Sorry, if, uh, I came more than usual or something?" Mirage replied.
"Think it's just cuz you can't pull out." Noah bit his lip. "And uh, you, uh, plug me too well for anything to leak out?"
"Fuck that's hot." Mirage breathed. His cock was starting to retract, rubbing Noah's walls and rim as it slid out of him.
"I'm probably gonna leak all over you seat." Noah pointed out.
"It's fine. Sexy as fuck. Seriously, we can just hose me out when we get back."
Noah stretched just a bit, trying not to stretch his stuffed belly in the process, and tried to relax back into Mirage's seat. "Feels nice."
"Yeah?" Mirage hummed, his engine kicked back into a rumble that had Noah whimpering. "You wanna just sleep while I drive us back?"
Noah breathed. He wasn't sure he actually could sleep, he felt too full and too good. "Yeah, I'll just, lay here a bit I think."
"Yeah, man, just relax." Mirage started reversing. His cock slipped out of Noah, finally retracting all the way.
Noah tried to clench his hole closed, but it was no use, he was fucked loose, and Mirage's spend was dripping out of him, leaking between his cheeks and onto Mirage's seat. He grunted Mirage did whatever shifting thing he did to close the gap between his seat-back and seat-bottom, hiding away the spot where his glorious cock came from.
"Fucking sexy." Noah breathed, his eyes were getting droopy after all. His pants seat was going to be covered in Mirage's silvery-blue cum by the time they got back to Noah's house.
"I'm gonna kiss you so hard when we get back." Mirage said. "That was awesome, fucking great sex idea. What's the human saying, 10 out of 10 would do again?"
"You're gonna do me again anyways." Noah mumbled.
"Uh, hell yes, I am." Mirage sounded like he was smiling. "Seriously though, you know I like, love you and shit, right?"
"Yeah." Noah hummed, his ass cheeks were still getting wetter. He should probably pull his pants back up, right? "I love you too, man."
Noah passed out before he could hear Mirage's reply, if there was one.