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You tapped your fingers against you leg, drumming them anxiously to the sound of the pouring rain outside. Occasionally you would steal a glance at Zim, still unmoving and unbothered as he watched TV.
Last night you'd caught him on your couch, sitting in that same spot, softly grinding against his own hand with a clearly explicit show playing. You froze when you walked in the room, stunned for a moment before Zim opened his eyes to you gawking. He threw the TV remote and your lamp at you before the ran back out red faced and flustered. You felt your mouth begin to pool as your cheeks turn red and shook the thoughts.
You weren't bothered by the incident, moreso shocked. You and Zim had briefly talked about the prospect of being intimate now that you were his so called, "squish partner." The conversation didn't really get anywhere though with Zim trying to pretend he knew more about it than he actually did and you being too flustered to make any notable progress.
That being said...
You shot another look over at Zim. He looked just the same as he had when you cycled through this five minutes ago. Bored and indifferent. If you were going to do this, it has to be now!
Gathering your courage you open your mouth, inhale, and...
Nothing.
Your muscles feel weighted with anxiety and a hint of shame. The most you manage to squeak out is a short exhale before it's right back to holding your breath. This is stupid! All you have to ask is one simple yes or no question then it'll be out of the way. It isn't that hard really. You've had to fight off cookie dough abominations that were more life threatening than this. You can do it, the worst he can say is no, here we go, yep, you're doing this.
"Hey, Zim?"
"Huh?"
His attention was still drawn directly to the TV.
"So about... Last night. I wanted to know if you would be comfortable..."
"Mhm."
Frustrated you took the remote from the couch and muted the TV.
"Hey! Zim was watching that!"
You pulled it out of his reach, much to Zim's offense. He began climbing over you, grasping desperately as your long arms held it above his head.
"Zim, quit it!"
"Give me back the remote!"
"I want to talk about last night."
That shut him up quick. He stopped mid swing to almost glare at you. Like you even did anything, he was the one sitting on your couch, watching porn on your TV! You were getting sidetracked, you're doing to do him, not get angry at him.
"So I wanted to know if you would be comfortable... Doing that with me...?"
The words come out in every way you didn't intend and you wish you could throw yourself out the window. Though in reality you stay planted right next to him on the couch as he stares you down.
"Yes, I would."
"Wait, really??"
"Yes, now don't make me change my mind, human."
"Alright alright! I understand. So uh, where should we start?"
=====
"Since this is our first time we'll go..."
You swallow hard as Zim wastes no time pulling off his shoes and pants. He leaves the top half of his uniform untouched but if you were being honest with yourself this was more progress than you ever expected.
You were already out of your clothes, having since moved to the bedroom so you weren't trying to cram yourselves onto the tiny couch.
Zim cleared his throat in either impatientence or annoyance, likely both, but you couldn't tear your eyes away from him. His pelvis is entirely smooth and hairless as is the rest of his body, but missing a certain appendage you expected him to have. That's fine, you can work with this.
You slid back onto the bed and patted your legs. Zim frowned slightly but followed your instructions, sitting turned to you and encasing you with his legs wrapped around your middle.
"If at any time you want me to stop, tell me, okay?"
He nods and waves you off.
"Yes yes, I'm not some simple earthen child."
You smile a bit at his overconfidence, you knew he was nervous, but you'd be lying if you said you aren't either.
Starting off slow, you lean in to kiss him. He eagerly returns it and shoves his hands into your hair, twisting it between his claws and simultaneously using it to push you further into the kiss.
Your hands find their way to his antenna, stroking them softly with careful fingers. Zim pulls back and chirps quietly. You inwardly giggle as he cheeks turn red. You'd learned near the beginning of your relationship he makes a cute variety of sounds when you try to do anything romantic with him.
He opens his eyes, mouth slightly parted and panting, and stares deeply back at you. You could take in this sight forever. He was putty in your hands and you can't get enough.
A groan from your needy alien reminds you that not everyone is so patient.
"More"
A whisper reaches your ears, barely, before Zim shoves his face into your neck, nibbling at the tender skin.
"Okay, I hear you."
Your fingers snaked down across his body, messaging the skin as they traversed it. You felt a smidge of pride course through you when you started kneading Zim's thighs and his whole body shivered, though you did stop.
"Is this okay?"
"Keep going."
He hisses out. Okay, you breathe, still going strong.
Gentle as you can, you drag your fingers across his folds. He chirps again, giving you the go ahead you needed to dip your fingers into his hole.
Zim cries out for a moment before silencing himself on your shoulder. You yelp and instantly pull away, Zim forces out what can almost be compared to a growl and digs his teeth harder into your skin.
You steady yourself, pushing through the pain and pushing him back softly with your non occupied arm. He lets go, thankfully, and looks at you angrily.
"What part of keep going does your human brain misunderstand?"
Exasperated you stutter for a moment, pointing to your shoulder that is now dripping red. Well that's just great.
"Hmp. Your skin is simply inferior."
You raise an eyebrow, his skin can't be that much more durable than yours.
"Is that a challenge?"
You say, hoping he'll back off and you can continue. He does not in fact, do that.
"It may be."
Without warning you grab him, plunging your teeth into the flesh between his neck and shoulder, just higher than he had done to you. You can't bring yourself to put any real force behind the bite, but by the way Zim hisses through his teeth you can definitely tell he's not getting let off without a mark.
After a short minute your jaw aches from the weird angle and you release him. Teeth marks are proudly indented in his otherwise clear skin. You can't help but smirk, not a bad job if you do say so yourself.
"Have you finished messing around, human?"
"Maybe I have, maybe I haven't. What's it to you?"
Zim crosses his arms with a pout and you laugh. Alright you suppose you're being a little mean, but it's not like he didn't start it.
With a chuckle you move your hand back to his pelvis.
"No biting this time."
Before he has a chance to respond you shove two fingers in his hole. Zim lets out a loud moan, his voice clicking. Looks like he's not as experienced as he talked himself up to be.
You glide your fingers back and forth near his front, searching for a clit that he doesn't seem to have. Zim squirms in your arms, his legs holding you in a death grip as you push in further.
You begin thrusting as he tries to speak, Zim forces out the words regardless. It's a bit impressive how persistent he is, you have to admit.
"HaaA! Yes... Praise me, your... Hng.. almighty leader."
"Oh? That's what you want? You want me to tell you how pretty you're being for me?"
He moans at that, you continue.
"You're doing so, so good, Zim. My sweet tallest, I'm only yours, this is all for you."
He pants out a small chuckle and begins gnawing on your sore skin, his antenna entangling with your hair as he does so. Wearing you watch him, but he seems too blissed out to get a good hold on you, so you let him be, setting your focus instead on curling your fingers and pushing them as deep as your hand would allow.
Zim chokes out a whimper and grinds down onto your awaiting hand. You can't believe you hadn't asked him to do this sooner, if you knew he'd look this hot against you, you would have jumped on the opportunity. That doesn't matter now though, because what does matter is fucking the soul out of your boyfriend.
Carefully you add a third finger and thrust it in time with the others. Zim's back arches and his claws find their way to your back as to not fall while he spasms. He clenches down hard on your fingers and a ridiculous amount of slick coats your hand. You curl your fingers a few more times, letting him rid out his high as more cum drips down onto your sheets below. Zim's body is still twitching as he pushes away your hand from the overstimulation. His face is red as his stares breathlessly at you. Realization finally washes over you. You can't believe you just did that. Without thinking you bring a soaked hand to your mouth, licking a stripe up your finger. It's.. sweet, almost too much, so you take your time in cleaning, Zim staring at you even more red faced than before.
"You're pretty sweet, you know that?"
A quiet squeak escapes him and he looks away. He looks adorable like this, you'll have to do it more often.
"Hey Zim, think you have it in you for one more? I'd like to try something."
That seems to get his attention. He eagerly nods.
You scoot toward the center of the bed and lay down, motioning for him to follow. Confused, Zim stays where he is.
"This is going to sound really weird, but I need you to sit on my face."
"Eh?"
"Look just..."
"Won't I smother you?"
"Welp, that's a price I'm willing to pay."
You joke, but Zim doesn't look impressed.
"Okay how about if I need air I'll just tap you?
Whether or not Zim would be able to notice you were tapping him during, you weren't so sure of, but what you did know was that that convinced him enough to get on the bed. A bit giddy you pull him by the hands up to your chest, which he straddles. His thighs are still slick and slid over your skin easily, sending a wave of arousal straight to your core that makes your mouth water.
"Ready, Zim?"
He scoffs dramatically and scoots forwards just the tiniest bit. Your heart is thudding a mile a minute and you're sure Zim can feel it with the way he squirms subtly. You take your hands from him to hold onto his perfect thighs. You can't help but admire their softness against the pads of your fingers. Slowly you feel Zim lifting up, bracing his arms on either side of himself to keep from crushing you. It was cutely considerate.
With a whimper he seats himself on your lips. It's an awkward angle trying to catch a glimpse of his expression, but you can imagine his eyes are squeezed shut and mouth slightly parted to let out small puffs of hot air.
Not wanting to delay him any longer, you lick a slow stripe along his outer folds. A buzz travels down your entire body when the taste of him hits your tongue, exploding sickly sweet through every corner of your mouth. Zim moans and grabs a hold of your hair, not that you're complaining.
You thrust your tongue in to it's farthest extent and he chirps again in session, using both hands to grip the sheets and grind himself down against your mouth.
His sounds and the feel of his thighs clamped hard around your head feel heavenly. Only now through the fog of your excitement do you notice how hot the room has gotten. Above you Zim lets out more chirps and groans as he damn well tries to smother you. Your lungs are starting to faulter and you ignore them in favor of plunging your tongue back into his slick entrance.
You aren't able to stay like that very long though as you are once again reminded of your lack of oxygen. Quickly you pat Zim's thighs in an attempt to get him off of you.
To no one's surprise he grunts and shoves himself harder against your mouth. He leans across you onto the bed to grip the sheets, legs tightly holding you as he pushes himself to a climax.
More desperatly, you push as him, to no avail. Welp, you lived a good life. It wouldn't be the worst death in the world to have your alien boyfriend above you, with an absolutely fucked out expression on his face.
Just as you think you're on the verge of blacking out, Zim crushes your jaw with an unbelievably hot strength and screams. He explodes like a fucking gusher, the substance invading your mouth and if you could get a breath in, you would be coughing and wheezing. Instead you try your best to not choke as you swallow what you can, tapping Zim in a last ditch effort to not go out like this.
Like an Angel's miracle, Zim scoots back and seats himself on your chest. You gasp for air, wiping your mouth and savoring the sweet oxygen you'd been depraved of for a short time.
You took one glance at Zim and could already see how completely wrecked he was. His legs, each outstretched on both sides of your neck, shook, cum still was dripping from his core onto you bare skin. His hands, clasped on your shoulders for support, twitched with his heartbeat. And with the way he's panting, you'd think he was the one getting suffocated.
You on the other hand, are starting to feel gross now that the heat of the moment has passed. Zim feels like a fucking furnace above you while the rest of your body is colder and sweaty. Your face is smeared with his slick and your shoulder, while no longer bleeding, is starting to sting. You don't particularly care for getting an infection so you decide it's time to start cleaning up.
Zim isn't quite back to reality yet so he makes no protests when you nudge him off to sit up.
"Hey, I'm going to go take a shower, you wanna come with?"
Rather than replying he holds up his arms expectantly. You chuckle and pick him up to start your walk of shame down the hall to the bathroom.
Once there you set him on the shower bench and make sure he's coherent enough not to slip off while you grab his soaps and a towel for the both of you. This isn't the first time he's bathed at your place, hell, he went through the trouble of installing a filter over all of your taps so he wouldn't be burned by any pollution water when he does stay over.
You step inside and turn the water to lukewarm. It feels nice against your skin.
Zim purrs as you bathe him, leaning against you and barely conscience the entire time, but still enjoying himself.
"Is it my turn next?"
He mumbles out, you aren't really sure what he means so you ask him to elaborate.
"To make you feel good. Do I get to do that next?"
You smile and a blush rises to your face, but he's clearly exhausted so you continue running warm water over the both of your bodies.
"When you feel up to it, I won't mind waiting."
He seems contented by this answer and leans against your uninjured shoulder, allowing you to finish the shower in peace. He's passed out before you can even get him into the spare bedroom.