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Morty has compulsive sexual behaviour. Everyone in his family knows, especially Rick. He can't go two days without masterbating, and it has led to awkward intrusions in his bedroom, even more so because Morty's room doesn't have a lock for Rick's adventure reasons.
Morty was watching something on his computer, his trousers and underwear halfway down his legs. He wasn't even watching porn. He was just scrolling on a social media sight. Every so often, small gasps could be heard from his mouth.
"Morty! We— we gotta go, Morty!"
"R-R-Rick!! Don't just barge in my room, y'know!?" I could've— I could've been changing my clothes!" Morty rushes to put his clothes back on properly.
"I've seen you naked enough times. Come on, we're gonna go retrieve some things!"
"No— no, Rick! I'm busy."
"I know what you're doing. You can do it when we get back. This is urgent!"
Rick grabs Morty's ankle as he quirms and tries to grab onto things to stop himself from being pulled away. "I'll jerk you off in the ship."
Morty's face flushes as he processes what Rick said, stopping his thrashing and tensing up.
Morty eventually manages to stand himself up once Rick lets go of his ankle. He follows Rick to the ship and wipes his hand on his shirt before getting in his seat and buckling the belt. Rick gets in the drivers seat, and they set off.
"Take off your pants."
Morty's face grows warm, and he stammers something inaudible.
"You— you only complied after I said I'd help you. Isn't it what you want?"
Morty gulps as he unbuttons and unzips his jeans, shuffling a little to take them off. He does the same with his boxers, putting them on the floor of the ship. Rick glances over at him. Morty's dick is fully erect, and he is fidgeting with his hands.
Rick takes his right hand off the wheel and spits into it as a makeshift lubricant, placing it on Morty's penis. Morty tenses up, looking out of the window.
He starts with a slow rythm, going up and down the shaft. Morty is pretty small, so the whole thing pretty much fully fits in one hand. Morty holds back a groan. He's never felt somebody elses hand on him in this way before, and it feels so much more intense than his own hand.
Rick moves his hand faster, Morty looking up and biting his lip. The feeling of someone else touching him is a little overwhelming for a kid like Morty. Rick focuses on what's in front of him while he drives through space and jerks Morty off.
"R-Rick— I— ghhh... slow down..!!"
Morty whimpers, gripping onto Rick's arm. Rick smirks, increasing the speed, and Morty's grip gets harder. A knot grows in Morty's stomach as he is grabbing onto the side of his seat to try and ground himself from the feeling.
He cums, moaning Rick's name as he does. Semen splatters onto the glovebox, and Morty pants, embarrassed. Hearing his grandson say his name in such a manner makes him hard.
"..Morty, do me a favour. Do- do your grandpa a favour and suck my dick."
"Wh-what?"
"You heard me, Morty... come on, i jerked you off. You- you love me, right?"
Rick gives Morty a glance, and Morty looks down at Rick's erect penis.
"Aw geez, Rick.. I- I mean... I guess it's in return.."
Morty stammers, unbuttoning and unzipping Rick's jeans, attempting to pull them down. He is taken aback by how huge Rick is. After a few seconds of staring, he lowers his head. Hesitating, he puts Rick's penis in his mouth, slowly going down the length. He bobs his head up and down.
"Y-yeah, Morty, that's it... attaboy— ngh.."
Morty's mouth is quite small and really wet, the feeling around Rick's dick causing Rick to make small groans. He isn't quiet at all, nothing like Morty assumed he'd be like. Rick always pretended not to care about anything, but it's always fake. It's just a facade to protect himself from people getting attached.
Morty moves his head faster, even flicking his tongue over the head and along the shaft.
"Yeah— just, just keep.. ah.. just keep doing that for grandpa..."
Rick moans, pleasured by the sensations his grandson is giving him while they're meant to be on a space mission. Rick finishes in Morty's mouth, Morty swallowing most of the cum. He lifts his head back up, some of the fluid dripping from his mouth.
"You did so good for me."