Rick stood swaying slightly in the doorway to Morty's room, silhouetted by the hallway light behind him, a gaunt looming figure filling the doorway. He blinked blearily, colours and shapes fuzzing and blending together, reaching a hand out to steady himself on the doorframe. His heart was thudding in his chest, and he reached instinctively for his flask even though he really didn't need it. A quick shake revealed it was empty anyway. Of course it was.
Morty was curled in his bed, completely oblivious to Rick's presence. Rick could see the rise and fall of his breathing, and he thought it looked so serene. Wobbling slightly, he made his way carefully over to Morty's bedside, sitting down lightly. Now he could see the boy's soft face, blank and perfect in sleep, his slender body looked so small. At Rick's less than graceful stumble over, Morty was roused, and blinked rapidly as his eyes focused. "R-Rick?" He asked hesitantly, "W-w-what is it?" Morty was sitting up now.
Rick swayed, not saying anything. He was obviously loaded and Morty became visibly nervous, fidgeting and glancing around the dark room. With a sigh, Rick rose and placed his hands on his grandson's shoulders. Morty went rigid at the unusual display of closeness. Rick seemed to be wrestling with something, frowning, Morty wasn't used to seeing him so indecisive. "Morty..." He whispered, and reached one hand down to rest on his grandson's groin. His sensitive teenage body reacted before his mind could process what was happening. He felt frozen with anxiety. "Y-yer a good kid Morty..." Rick mumbled as he began stroking Morty through his underwear.
"Rick!" he yelped, "Wh-wh-what are you DOING?" Morty scrambled away, but quickly felt the wall at his back, and Rick was advancing. He held his arms out in front of himself warningly, wide eyes looking panic-stricken into his grandpa's heavy lidded ones. Rick reached out and grabbed him by each wrist, pinning his arms to the wall. Morty felt trapped and exposed and his anxiety spiked painfully. He was starting to hyperventilate as Rick eyed him from above, pants tightening visibly as he watched Morty struggle weakly beneath him. The panic attack was making him even weaker than usual. Rick leaned in suddenly and kissed Morty, forcefully, his tongue forcing its way into the boy's mouth, exploring relentlessly. He tore himself away just as suddenly and kissed sloppily down Morty's neck.
Rick ground himself roughly into Morty, finding Morty's hardening cock and grinding into it, growling quietly. Morty seemed to come back to himself suddenly and he started shrieking fearfully, calling for help, until Rick grabbed him by the hair and shook him roughly. He had both the boy's tiny wrists pinned with one spidery hand. "Shut up!" he whispered, "Shut the fuck up." He leaned in to Morty's face, sickly sweet breath choking the air between them, and said, "They can't hear you Morty. I-I-it's some science stuff. I-I-I-it's in the walls. It's everywhere. No ones coming, Morty, s-s-so do us both a favor and quit scEUUUGH-screaming your head off."
Morty panted heavily beneath Rick, tears running down his cheeks, but remained mostly silent. His eyes changed from pleading to angry and back again, but Rick hardly noticed as he gave a tentative thrust, grinding the boy again while he looked into his eyes. Satisfied with his grandson's compliance, he released his wrists and fumbled with his belt, sliding it off, his pants quickly following. Morty was hugging himself with knees drawn, but Rick tsk'd at his posture and grabbed his arms again, turning him to face the wall roughly.
The boy put his hands out to brace himself, sweaty palms flat against the wall, head twisting back to flash another pleading look at his grandpa. Rick didn't seem to notice as he positioned himself behind Morty, naked below the waist but with his stained t-shirt hanging just above his cock, lab coat flowing out around him. Morty was rigid with fear, his body like a tensed bowstring. Rick watched him shut his eyes tightly, the little bit of boyish muscle he had straining and trembling with tension.
"J-jeezus Morty..." Rick mumbled, suddenly embracing Morty, rocking forward clumsily. Morty was shocked by the sudden tender gesture, and felt himself melting into the hug, while his heart still thudded uncomfortably in his skull. Morty felt the hot sting of tears dripping on his shoulder from where Rick's face pressed against him. Just as suddenly as the hug had begun, Rick broke away from Morty and shoved the boy down into his pillows, ass raised tenderly into the air. The older man sighed deeply, one hand working lazily at his already erect cock.
He pressed lightly at Morty's entrance as the boy whimpered beneath him. The light pressure increased steadily, and Morty leaned forward involuntarily, a small cry escaping him. Rick's grip on his shoulder simply tightened as he forced the boy backwards, down onto his cock. The boy cried out in earnest now as the head of Rick's penis forced its way inside him, and Rick mercifully paused as soon as it was in, groaning in a quiet voice and closing his eyes blissfully. He'd wanted to do this for so long. He'd imagined it so many times, enough to bring him to this point anyway.
After this moment's rest, Rick started inching forward again. Morty jerked forward, so Rick simply went with him, bearing down on his grandson until he was laying flat on top of him, his cock buried neatly into the boy's virgin ass. Morty twitched uncontrollably beneath him, squeaking and moaning, and Rick felt his cock twitch at the pleasure of it all. He buried himself up to the hilt, and relished the tight wetness of his grandson's ass. Just the thought of how sick it was made him want to pour his cum into the boy. Not yet, he reminded himself sternly.
Rick propped himself up again- Morty was making little pained sounds high in his throat, and Rick placed a thin arm around the boy's kneck, grabbing him in a sort of headlock and wrenching him back up to the arms-and-knees position he started in. "Stay." Rick growled, and started moving.
He fucked the boy mercilessly. The room was suddenly filled with a wet slapping noise as Rick pounded into him, still holding Morty in the lock so he couldn't move away. At first, Morty's cries were in time with Rick's thrusts- "Ah! Ah! Ah!" But as he continued at this pace, it degenerated into sobbing and begging. "Ahhhnnn, R-Rick, p-p-p-pleeease, Rick! Stop! Noooo..." Morty made a hopeless sounding high pitched keen, but the begging just made Rick want to fuck him harder. With a flex of his bicep, Rick put pressure on Morty's throat, grinning as the boy's crying was cut off. He doubled his pace then, feeling his climax slowly build. It was going to be huge- he would fill the boy up and then some.
Morty's face was darkening as Rick fucked and strangled him, a dark invisible force behind him, bearing down on him relentlessly. Rick snaked a hand out to lightly stroke at Morty's trembling cock. After a few strokes, he felt the boy cumming, his tiny hips bucking, and it pushed Rick finally over the edge. His final thrusting growl turned into a long moaning sigh of release as he poured seed into the tiny body beneath him. He felt his cock pulse, and hot cum spilled out the edges as he filled the boy, dripping down obscenely onto the bedsheets. After a final few twitching thrusts, Rick pulled out, leaning backwards, heart racing.
He surveyed the scene before him- Morty, splayed out on his rumpled bed, naked except for his t-shirt, cum still dribbling out from his ass. He looked completely out of sorts, and Rick's cock gave a little half-hearted jump at the thought of what he'd just done to his own grandson. Morty seemed to have passed out momentarily, probably from the pressure on his throat, but he roused shakily as Rick watched. He seemed to have a sudden moment of rememberance, and, trembling, reached for his sheet to shyly cover his nakedness. As if that mattered now, Rick chuckled quietly. With a sigh, he stood. That was fun. It had been even better than he had expected. "Shut down." he said, and everything went black.
Rick pulled the VR helmet off his head roughly, swaying where he sat on his cot. The room was dark save for a tiny sliver of light coming in from a crack in the door. He thought he remembered to close that before he began. Reaching for his flask, he found it empty, and sighed again.
A bundle of wires ran from the helmet down to a metal sheath that covered his cock. It was lined with silicone, and realistically simulated sensations in VR, including heat and lubrication. Now it was also dripping with his cum. He pulled it off and let the helmet and sheath fall to the floor with a dull clatter. The world was spinning and he lay back, breathing deeply. Soon he was snoring quite loudly, and didn't hear the soft patter of footsteps retreating from his door.