Double Secret

by SciFurz

Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa, Consensual, Romantic, Heterosexual, Fiction, non-anthro, Were animal, Incest, Brother, Sister, Oral Sex, .

Desc: Incest Sex Story: Romy and Luis have the house to themselves while their parents are on a long cruise to celebrate their wedding anniversary. After they encounter one night what they thought was a big dead dog, the brother and sister not only discover they're transforming, but also their true feelings for each other. Another favourite story, and one of three I did so far with an incest theme that I thought would fit into it and not just because of having incest as a kink.

‘Geez, will you two grow up already?’

Romy and Luis watched their mother come in and sigh when she saw her kids occupying the couch. Luis, her son from her first marriage, sat back, reading a French novel for class and Romy, the daughter out of her current husband’s first marriage, had nestled herself with her stomach down on his lap, zapping through the TV channels.

Marielle had met Fernandez at a local support group after she lost her then husband to a car accident, and he had lost his wife to sudden cancer. Luis had been four and Romy three at the time, and the two grieving parents gave each other support by taking care of the kids when either of them needed some time to be alone. The kids got along well and they started spending more time together until they had to face their insecurities of getting involved with someone again. They had a long emotional talk and decided they would risk it and start dating each other. A year later they got married and Marielle and Luis moved in with Fernandez and Romy.

‘You’re supposed to be adults, but you act like ten year olds, clinging to each other all the time.’ Their mother sat down in her comfortable chair with her drink. ‘If I had known you’d still be like that I would have preferred you two fighting like most brothers and sisters did when they were little.’

The step siblings looked at each other, then grinned at their mother. ‘Would it help if we start fighting now?’ Luis asked.

‘Oh god, no!’ said their mother, rolling her eyes up. ‘You’re too big to spank and send up to your room without dessert.’ She took a sip from her drink and looked at the cruise tickets on the table next to her. ‘At least I won’t have to worry about you tearing up the place. Unless you kept it a secret that you found a boy or girlfriend?’

‘Pfft.’ said Romy. ‘Guys are stupid. They’re only interested in me because of my looks. And if I need a handsome guy for something, I’ll just use brother.’

Luis chuckled behind his book. ‘See? No chance to find the right girl because they’re all jealous when my cute little sister hangs around me.’

‘You’ll both end up old and alone... ‘ sighed their mother.

‘More likely old and still hanging around on the couch like that.’ said their father, coming in from a quick visit to the neighbours. ‘Maybe with a few extra cats.’ he chuckled and put the tickets into his coat pocket. ‘I’ve left the contact details with Debbie and Frank. Frank offered to drive us to the airport tomorrow to save us cab fare. He had to get up early and head in that direction anyway.’

‘Oh, that’s sweet of him.’ their mother said. ‘Then we’re all set.’

She finished her drink and kissed her kids good night before going upstairs to get some early sleep. The siblings wished them a good night since they wouldn’t join their parents on their month long cruise along South America. Fernandez wanted to give his wife something special for their fifteen year anniversary, and the siblings suggested and chipped in for a luxury cruise. Their mother cried in happiness because she had always wanted to go on a long cruise.

Romy switched off the TV and rolled on her back plucking on a lock of hair. ‘What about Francesca?’

‘Hmm?’

‘That girl in your French class? You’re not interested in her?’

Luis flipped a page. ‘She’s nice, smart and pretty. But I just can’t get interested in her that way.’

‘She asked about you yesterday.’

‘Well, I’m afraid I’ll have to let her down then. Not my type.’

‘What is your type then?’

He thought it over for a moment. ‘Actually, no idea.’

Romy chuckled. ‘You’re hopeless.’

He hit her forehead playfully with his book. ‘Says Miss-no-guy-will-ever-meet-my-standards.’

‘At least I have some kind of standard to measure with.’ she chuckled and tickled him.

He knew she loved to take advantage of his weakness, but she did have the same one and he attacked her back. Half a minute later they were out of breath on the floor. Romy rolled on top of Luis when she got some strength back. ‘Maybe they’re right and we are hopeless. But then we should be careful doing this before we die of a heart attack.’

Luis smirked. ‘I think that would happen even before we get old.’

‘I guess we’re doomed then.’ she chuckled and gave him a quick kiss before crawling up on her feet. ‘Good night, big brother. Don’t forget to get up early to see mom and dad off.’

‘Sure.’ he said and sat up, looking for his book.


Romy looked at her stepbrother’s peaceful sleeping face, carefully lifting up his blanket to expose the back of his naked body because he couldn’t sleep with clothing on, and slapped his rear, waking him up screaming.

He looked bewildered for a moment, saw his little stepsister laughing and jumped at her, grabbing her by her waist. ‘You little minx!’ he said, dragging her to his bed to bend her over his lap, smacking her ass playfully while she kept laughing. ‘Sneaking up on me and scaring the shit out of me, eh?’

‘I told you you had to get up early.’ she said between laughs. ‘Your own fault.’

He let out a grunt and fell back on his bed, rubbing the sleep out of his eyes while she pushed herself up from his lap, snickering. ‘At least part of you is up early.’ she said and poked his hard dick. He grabbed his pillow and threw it at her. ‘Get out!’

The family carried the luggage out the door to Frank’s car a little later. ‘Morning all.’ he said, opening the trunk and doors.

‘Morning Frank.’ said Fernandez. ‘Thanks again for giving us a lift.’

‘It’s nothing.’ said Frank, taking the suitcase from Marielle and putting it next to Franks in the back. ‘I might even be in the neighbourhood when you come back so give us a call on the trip back.’

‘We’ll keep an eye on the kids as well.’ said Debbie, seeing Marielle looking back at the house.

Marielle hugged Debbie. ‘Thanks. But I’m afraid those two are so boring you’ll make more noise than them in the meantime.’

‘Moomm... ‘ said Romy, faking a pout.

The siblings hugged their parents before they got into the car. ‘Have a safe trip and give us a call when you arrive.’ said Romy.

‘And postcards so we know which ports you’ve been at.’ said Luis.

‘We’ll do.’ said their mother and they waved for a while after Frank drove off.

‘No plans for wild parties then?’ asked Debbie, nudging Luis.

He grinned. ‘Oh, I do. I want to have a wild night with a marathon of Star Trek and Alien movies.’

Debbie chuckled. ‘I hope I won’t have to call the cops then.’

‘We’ll bribe you with a nice bottle of wine.’ said Romy, hanging on Luis’s arm.

‘You really are bad.’ said Debbie and shook her head in fake exhaustion. ‘Well, if you need anything, come on by.’

‘Thanks.’ said Romy, giving a quick wave before they went back inside.

Luis stretched and yawned inside.

‘Lazy bones.’ chuckled Romy.

‘I had to study last night.’ he said. ‘Unlike some.’

‘Can’t help it that I won’t have to take the same classes as you for another year.’ she said, playfully sticking out her tongue.

‘Prepare yourself then.’ he said and looked at the clock. ‘At least I can get a couple more hours of sleep before first class.’

Setting the alarm on his mobile phone, he decided to use the couch because his own bed would be too comfortable now and make him oversleep. He had barely fallen asleep when Romy walked into the living room. She did feel a little sleepy herself and figured she might as well join him. She took off her jeans which weren’t comfortable to sleep in and snuggled up with her back against his front. She had always enjoyed his warmth and used him as a heater when she felt cold, and after wrapping his arm around her she fell asleep quickly. When they woke up from his alarm he wasn’t much surprised to find her in his embrace. He slapped her ass. ‘Who’s the lazy bones now?’ he said, chasing her off the couch.

She smirked at him. ‘Then you shouldn’t have been so comfortable.’

He shook his head. ‘Let’s just get to school.’


To include their children in their anniversary, Marielle and Fernandez had given the siblings tickets for an all expenses paid dinner and late movie on the day they’d celebrate it on board. Luis was just checking which shirt he’d wear when Romy walked in in just her panties and held up two short dresses.

‘Which one?’ she asked. ‘Blue or black and red?’

He watched her as she held first one, then the other in front of her. ‘I’d say blue.’

‘Really?’ she asked and held it in front of her. ‘Why?’

‘The weather’s warm, so you can show off your shoulders and back with that strapless thing.’

She smiled and draped the dresses over the back of his chair. ‘Okay, but then you need to wear something matching.’ she said and nudged him aside to look at his shirts. She pulled out a few, held them in front of him, then settled on a black one with stripes the same colour blue as her dress. ‘There. Wear this.’

‘Fine.’ he said, taking it from her and giving her a pat on her ass. ‘Hurry up and get ready to go. We still have a thirty minute drive.’

‘It’s customary to wait for the lady to get ready.’ she said and stuck out her tongue before leaving.

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