The Story So Far: After surviving a devastating attack on war-torn Mars, a lone human male and a female android try to survive in ruins of a wrecked spaceship.

After fine-tuning Panko's new actuators, Wyse began applying her synthskin grafts. She was nude like before, but this time neither made a big deal of it. The female-coded android was slim but modestly curvy, with slate-gray skin and long bluish hair that fell past her shoulders. Her face was featureless display screen, much like the visor on a motorcycle helmet, rendered non-functional with a crack running diagonally across it.

The human maintenance engineer followed the usual top-down repair pattern, starting with her head and working toward the rest of her body. When he got down to her upper abdomen, she suggested, “We could make that area bigger, if you want.”

He blinked, then blinked again. “You mean your chest?”

“I know you like observing that part of me, when you think I am not looking.”

He opened his mouth to deny it, then thought again. A robot would pretty easily be able to detect his eye movements. “Sorry. I try not to do it often.”

“I appreciate you being polite about it. But enhancing that area might also give you more options for a pillow at night.”

He ran his hand through his short bister hair, thinking she was joking, but she seemed serious. They certainly had more than enough smart gel packs to pad her generously.

Plus, the primal, eternally-horny male part of his brain was practically screaming at him to do it. “Are you sure? You won't mind?”

“It was my suggestion. Just make sure I do not have trouble squeezing into a vac suit.”

He laughed. “We’ll go as big as you want. Just tell me when to stop.”

At her go-ahead, he began working in the individual gel packs, and feeding them programmed current so their contents slowly expanded and molded together with the ones already installed. Panko kept him going until she grew from a modest B-cup to a full C-cup, with just a tinge of sag. Afterward, he spent the next half hour repairing the rest of her synth skin.

He was just about to pack away the repair kit when she stayed his arm. “Wyse, wait. Maybe we could do a bit more?”

“Is there a spot I missed?”

“Technically, no. But now I feel my outline might be too top-heavy. Perhaps we can even things out down here to match?” She turned and leaned over, striking a pose that pointed her posterior at him.

The young man sucked in a surprised breath. Was she just openly teasing him now? “S-sure. It shouldn’t take too long.”

He carefully split open the electrostatically bonded seals on the synthskin around her buttocks. He followed her direction at inserting the gel packs and adding additional skin to expand her rear. Like with her chest, once the smartgel was installed, its own internal programming took over shifting, expanding, and evening out the additional material into the proper proportions. He kept showing Panko screen shots of her new bottom, making manual adjustments as needed.

When the whole process was complete and the synthskin seamlessly sealed back up again, Panko pushed her newly-rearranged arse up at him. “What do you think, Wyse? Nice and pillowy. Could you get some good sleep on this?”

Eyebrows on the male raised high. He had gotten so used to her restrained formality that this casual playfulness caught him by surprise.

Panko’s enhanced posterior not only included thicker buttocks, but wider hips as well, the new curves blending fluidly into thighs and waist. Where her rear before had boasted only two modest bumps that merged smoothly into one another, her new one an actual, if small, cleft between her cheeks.

The male felt his heart beat rapidly as he regarded her raised chassis. He might have had some out-of-date thoughts about robots, but he wasn't so dumb as to ignore a woman showing off her naked backside to him. “I think... I think maybe I can’t tell how soft it is just by looking.”

The robot looked back over her shoulder. Her blank face screen regarded him for several long seconds, and for a moment Wyse thought for sure she was going to pull away. Instead, she pushed her posterior up at him even more. “Then you should feel as much as you want.”

His palms were on her smooth synthetic buttocks without a second thought. His fingers roamed over her curves, delighting in how pliable they felt when gently squeezed.

She giggled lightly. “I guess you like feeling up my lewd robot ass, hmm?”

“I do,” he confessed. “But I don’t think I ever heard you say dirty words like that. Much less expect you to, you know...”

“Act dirty, too?” She wiggled her bum under his fingers. “I’ve told you I am capable of a full array of human emotional responses.”

“Including acting horny?”

“Who says I am acting?”

She gave out small gasps as he bent down and delivered an affection kiss on her curves. “You can ‘test out’ my new buttocks, if you want,” she said. “The way males like.”

He blinked, suddenly acutely aware of his shaft hardening in his trousers. “Are you sure that's okay? You’re not just following some company courtesy policy or something?”

“Company courtesy? Do you think this is in a corporate manual?” She turned and reached back, fully encircling her fingers around the tip of his member as it poked up into the fabric of his leggings. She rubbed lightly, delighting in the cuteness of his deep moan. “You have treated me very nicely, and have rescued me twice now. It makes me think you might be a good partner for more than just immediate survival. So, do you want to scratch this itch we obviously both have?”

“Sure! But, uh, how do we work this?” When he had found her, Panko had been as smooth as a storefront mannequin, lacking physical genitals. Apparently those parts on modern androids were modular and removable, and she'd had stored hers away to better concentrate on her job as a ship's steward. Unfortunately those were inaccessible now, smashed to ruin along with the front half of the ship during the crash landing.

“I do have this very new jiggly butt.” She flattened herself onto her stomach on the crash couch. “Do you know what 'hotdogging' is?”

Wyse stripped and tossed aside his clothing in record time. He rummaged around in a recovered medical pack and fished out antibacterial gel that could double as lubricant.

With just a few squirts he covered the newest cleft in Panko’s synthskin, making her titter lightly. The android shifted forward to make more room for the male and braced herself, with hips slightly raised in clear invitation.

Panko might have been synthetic, but her soft coo of encouragement sent instinctive sexual shivers deep into Wyse's very organic male hindbrain. He hastily climbed fully up onto the crash couch to straddle her thighs. He shifted his hips forward, laying the full length of his throbbing member into the valley of her haunches. They both groaned aloud as his shaft made contact. Her slate-hued synthskin felt sleek and warm.

The human planted stiff arms on either side of the robot’s shoulders as she held onto the couch's edge. “Fuck me,” she told him. “Fuck me nice and rough.”

“You really like dirty talk, don't you?” he said with a laugh as he began pumping back and forth in the valley of her rump. He moved slowly and gently at first, then faster and coarser as the minutes ticked by, shagging her synthetic posterior for all he was worth. He completely lost himself in the intense sensations, grunting out his pleasure like a wild beast.

Panko whimpered continually, arching her back and eagerly pushing her rear back at him with every stroke. Wyse couldn't be sure of how much actual pleasure she might be feeling, but she was still clearly enjoying the sensation of being fucked.

Wyse would have loved to have kept going all night, but it had been too long since he'd had sex, and Panko felt so exquisite under him. After only a few minutes, before he could even utter a warning, his dick throbbed powerfully and exploded all at once in orgasm.

His first heavy spurt rocketed right over Panko's head as he cried out. The following sticky loads painted the charcoal gray of her slim back with long lines of pearly white before the last dribbles seeped out all over her rounded ass.

Wyse came down from his orgasmic high, feeling as if all the energy had been drained from his entire body. He slumped limply on top of her, then slid over beside her on his back. Panko lay her hand on his shoulder, which he immediately took up in his and gave a gentle kiss to.

Her words were pleasant, but Wyse barely heard them. In another instant he fell into a deep exhausted sleep, completely and utterly spent.