Disclaimer: I do not own Dragonball Z nor the characters

note: major lemon in this chapter.

Unthinkable Lust

~Though it wasn't nessessary, Cyborg 17 slept after his long night Chichi.

Seventeen awoke at noon and found himself alone in Chichi's bed. His clothes were laid out on the far edge of the bed. He dressed completely and reached into his pants pocket to check his phone. 'Oh fuck.' he thought when he activated it. '22 messages', '8 missed calls', posted on the front screen. He checked a message from Eighteen.

I'm going to Capsule Corp to update my CPU like you did. I in more speed techniques. Tonight at 6 I'll be there.

'Ok good, I have time,' he thought. Adjusting his jeans, he walked into the family room. Chichi was laying on the couch. "Ohayou love," he softly said sitting down with her.

"Seventeen," she smiled shyly. "I really love you. I wasn't just saying that because... you know," she blushed, again with shy body language. The mother and widow had never done anything like what she did the night before; her only partner had been Goku. "Kiss me."

Seventeen leaned down, gazed into her loving warm eyes, and kissed her with passion. "...I love you too... really." The big grin on his face caused her to giggle. He quickly noticed that she was relatively motionless. "How did you wash my clothes, dress yourself, and come in here?", he seriously wondered curiously. She laughed in response.

"Well, I woke up early, bathed and did that other stuff. But after a while, my legs grew weak, and I was always walking funny. So I've been here for a while," she explained. "You fucked me so good, I'm still weak from it."

"As long as you enjoyed it, I'm content," he said brushing his hand on her soft cheek. She was painted red, and her eyes danced looking at her new found love. She snapped out of her daze.

"Oh Seventeen, baby, you need to go," she said with haste. "Gohan and Goten are coming back. I'm so sorry," the mother with a crush began to cry.

"What's the matter? Are you regretting last night?" he hesitantly asked.

"No, No, No, No, Kami sama No," she began to explain as he sighed in relief. "I'm sad because I wish you could stay."

"Oh don't be sad, I have to go to Capsule Corp with my twin later anyway," he consoled her. "I love you, and we will spend more nights together." he said before kissing her.

~They said a long goodbye and part ways. Android 17 went straight Capsule Corp. To his surprise, his android hybrid twin was waiting for him at the door. Her face blank with her arms folded as usual.

"You're early," he said to his sister.

"Ugh. Where were you? And why can't I sense you anymore?" she asked annoyed.

"After you upgrade you will sense me again," he explained. "I spent the night at Goku's house. I wanted to apologize for my original mission of killing Goku. I just fixed up her house and shit to show my affection."

"So you apologize for trying to kill her husband, then fucked her?" she giggled and joked with her brother.

"Let's go inside, I can make you a wardrobe of RRCC gear," he offered.

"Sweet, I need some new clothes," the blonde twin goddess replied.

~They decided to upgrade her hardware programming first. C18, being a genius aswell, did it alone. C17 used the time to discuss Capsule Corp's current and future projects with Bulma. C18's upgrade was a success, afterwards 17 came back to the lab with a series of new outfits of his department's design (RRCC). She, afterall, was a company partner now.

"Stupid! This doesn't fit me," she complained as she picked up one of the shirts.

"I am trying on some to... Stupid," he snapped back. "That pile is mine, yours is on the other side."

"Haha, oops." She looked down at one of her outfits. "This one is so fucking cute. Let's go change upstaires in you place."

"Yeah," he nodded as they began to walk there.

~~moments after they entered his room~~

"This place is so damn nice. How the fuck?" she said to her twin.

"I know," he continued, "Put one of those on Eighteen. I want to see if they look good."

"I am, I am," she smiled. She pulled off her raggy black overshirt, followed by the white long-sleeve undershirt; leaving her light pink bra on. She sat on the bed and removed her boots and socks. She got up and pulled her jeans down and off, and to Seventeen's surprise, she was wearing a matching light pink thong.

"Your body is way fitter and sexier with the upgrade 18," her twin complimented. 'Really...' he thought.

A blush quickly painted across her cheeks. "Hey! You did some mods to your body too," she added as she began to try on an outfit.

"Chichi had a really good body, by the way," he informed her as she dressed. "You would never know with the dresses she wears."

"Yeah, I figured she was boring naked," she giggled. She was dressed in a new outfit, although barefoot. "You like?" she asked spinning.

He took off his shirt to try on one of his new outfits. "I do, they designers did a good job huh?"

"Yeah," she smiled as she stripped down again. The cyborg hybrid was back in just her bra and panties. "Ooo hey. Try those black, ripped up jeans. So fucking cute on you, I'm sure," she requested waiting with hands on her hips.

He unclipped his belt, unzipped and slip them down; but as the jeans fell down to his ankles, he had forgotten something...

~Though everything had been innocent to this point, this changed that.

Eighteen gasped. Her eyes widened, the cold blue goddess's eyes were glowing, and a look of shock on her perfect face.

'Shit, I forgot,' a-17 thought too late. The artitificial twins stood frozen in silence. a-17 didn't wear boxers to Chichi's house, so that his bulge would be more visible. But he didnt get change when he came home. However, something made this worse...

'Why is it hard? Is it from me?' C18 thought as her twin was infront of her. 'My god, Krillin doesn't have one like that.' C18 thought again. She did the calculations on his size. 16.3 inches came through to her. She finally broke the silence. "Did I make you hard Seventeen?"

"Yeah," he admitted with no fear, "Ever since the upgrade, I've been alot more sexual. I didn't design the program to add the extra 4 inches and the extra width to it, it just got bigger after."

Her golden locks were just below her chin level. A face that embodied perfection. Cold blue inviting eyes. Eighteen's breast were still a large C-Cup. Her stomach was trim and slightly ripped. Her hips were wider than her tummy. Her ass was perfectly shaped and big. Eighteen's shiney, silk skin was evident by her long lustrous legs; with fit calves and thighs. Her feet had a high arch on her smooth soles; toes perfectly shaped. She was a work of art from head to toe.

"Well, you got sexier too," she blushed shyly. "Your body and cock are amazing. But since I'm fair...." She unhooked her bra, exposing her perfect, pink areolas. She grabbed her mounds and squeezed them together. During this, Seventeen sat on his big bed, still nude. Facing his direction on the other side of the room, C18 grabbed the thin lace on her waist an pulled them off. She turned around and rubbed her ass before standing on her tiptoes for her twin.

a-17, as 18 did this, grabbed his cock. "I hope you don't mind if I..." he cut off and started stroking his incredible length. "You're dripping 18..." She approached the bed.

She laid down and started fingering herself, eyes right on his cock. Seventeen crawled over to her spread legs. He stuck his head between her legs and smelled her scent. He licked the lips before tonguing the clit rapidly. "Oh Kami this is so hot! Oh Yea... You have an amazing tongue 17!!"

He paused in the middle and laid on his back. "Come sit on my face." Eighteen stood up on the bed, and kneeled down over his face. He licked her asshole before resuming. His longth thick, tongue wiggle in her depths and moaned loudly; dropping to all fours. She couldn't resist the cock now in her face. She licked the layer of precum dripping off his tip.

"Yummy, your cum tastes sweet Seventeen," she said, before she took the head into her mouth. She stoked the the portions outside her mouth. The twins were now 69-ing intensely. C17 let out a mouth from her depths as Eighteen took 11 inches of his cock into her mouth and throut. While Seventeen had the power to cum at will, 18 didn't have the same power; because during the first half hour of this, she had tons of them. Both continued for several minutes, 18 bobbed her head taking the biggest cock of her lift, while 17 tasted her sweet honey and played with her clit.

~~moments later

a-18 pulled her mouth off of his massive cock, continuing to stroke it, "My spot! YES! I'm close baby." Screaming in pleasure, C17 picked her up, and laid her on her back at the edge of the bed. He lifted her legs up in the air, spread wide. He dug his tongue in to her depth, right on her sweet spot; rubbing her clit with one hand, and fingering her asshole with the other. "I'M CUMMING! OH FUCK! OH, I'M CUMMING," Eighteen chanted and screamed as her climax exploaded on her twins mouth. She blacked out from the amazing orgasm. Seventeen took this time kiss and lick every inch of his twin goddess figure. The andoid licked from her collar bone down to he pink center. He grabbed her breasts and sucked each of her nipples. Putting her legs straight up in the air, he licked from the thick ass cheek up to her ankle, and did the same to the other leg. Her smooth, silky skin drove him crazy. He kissed every inch of the soft soles of her feet; ever since Chichi begged him for her to suck her toes, he has a kink for feet. He licked the soles up to her toes, where he sucked each toe. As he sucked her toes, Eighteen regained consciousness. "Mmmmm... Baby that feels so good." They switched positions, 17 on the bed, 18 on her knees. "Time to finish you..." she said as she deep throuted him, she took 11 inches of his giant cock.

His hand ran through the golden locks on her head and gripped it as she bobbed up and down his cock. "Fuck... keep going." After several minutes, Seventeen decided to trigger his climax. "I'm cumming!!" he yelled as she pulled her mouth off of it, opened wide, and looked deep into his eyes.

"Cum on my face!!" Eighteen commanded right before his burst. Multiple strings of thick, creamy cum exploded onto her. The first strand landed in her golden locks. The second landed on her eye and covered the right side of her face. Then the next few exploded into her her mouth filling her with his cum. After that he eased back, cock point upward, and the cum shot up and landed randomly; he finally drained and looked down to her. He found his twin covered in assorted strings of his thick cum all over her. C18 gulped as she swallowed the mouthful he shot in her. She looked at him with one eye, the other shut by thick cum. "You are amazing Seventeen. We should end her before we go too far."

"Yeah, not before we shower, you need one big time," he said; she giggled.

~~They kissed each other only once on her visit and it was in the shower. The twins wanted to fuck, but decided not to for obvious reasons. Both tried on their clothes and 18 left after a long visit. later, Seventeen was in the office doing paper work with Bulma.

"Hiroko, bring me and C-1-7 some Scotch," Bulma buzzed her secretary from her main office.

"C-1-7?" Seventeen asked.

"My dad put it on file, so that's your official title," she giggled...

~~~* end note: Future chapters coming very very very soon. More to come with several other characters, and further plot development.