Author's Note: Most of my works have a strong cherishing and romantic angle to them. This... Is not that. You've been warned.
The realism on this one has also been dialled way back.
Warning: This story contains scenes of non-consensual or reluctant sex.
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If there was any simple way to summarise why Luc decided to go to university in a different city to his family, then it would revolve around four very simple words.
"Tell me to stop."
They were words that haunted him late at night. When he wanted his mind to shut down and let him sleep, it brought up those little words, and the tone that uttered them.
Memories of the little sister who relentlessly teased him with them, as she ever so slightly stepped over lines that should never be crossed between family.
It wasn't that he had a bad relationship with her.
For the most part, they were just brother and sister. They had their little fights, and then they went by. Both of them knew they could always call the other for help.
The problem was that... Every now and then, out of the blue, when he was alone around her she would do something crazy inappropriate. When he tried to stop her, she'd use those four little words, and... And he found it tempting not to stop her.
It had all started on her eighteenth birthday.
Or to be more precise, the morning after her eighteenth birthday. Luc had a little too much to drink during the party, and had expected to wake up hungover, and spend the day finding excuses not to climb out of bed.
What he hadn't expected was to be woken up before sunrise with Mia lying on top of his blanket, staring him in the face.
She'd seemed so excited, just like she had the night before. Luc hadn't suspected a thing. Just his grinning and cheeky little sister.
He'd groaned something about it being too early, which it actually was, and dragged the blanket over his head.
Mia laughed at him and yanked the blanket not just down but threw it off the bed altogether. "That's the point. You don't want to get caught like this."
"What?"
She'd shushed him, putting a finger to his lips, and then her other hand snaked around his morning wood, just his pyjamas between them. She didn't exactly start to jack him, just held him.
Luc swallowed nervously, "Mia..."
She'd smirked, and said those four words for the first time.
He had... Eventually.
His sister bounced to her feet, threw the blanket at him and laughed as she left the room.
That was the first incident, the first time that she'd cross the line and teased him. Making him wonder exactly what would happen if he didn't stop his beautiful sister.
Half the problem was that she was beautiful. Absolutely, utterly, stunning. If we were in another country, she might have been drafted into a cheerleading outfit.
Naturally wavy brown hair that cascaded down to her shoulders, bright blue eyes that were too easy to get lost in. Full lips, and breasts that other women would kill for.
She only got worse after that first moment.
Cornered a few times in the bathroom, including once where she didn't just grab a hold of Luc, but slipped her hand directly into his clothes before he even knew she was there.
Always whispering those four words.
Always making him want to stay silent, and see just how far she'd take it. To see if she was just fucking with his head, or that by some miracle the forbidden attraction really was mutual.
Luc regretted it each time, telling her to stop.
They never discussed it after she went out of her way to mess with him. Luc had tried, once or twice, and Mia had simply played dumb. As if she had no idea what he was talking about.
In the end... Getting away from her and the random surprise attacks seemed for the best.
All the same, he didn't cut off all contact from Mia. She was still his sister, and apart from those terrifying words, he got along with her well.
Which meant that soon after starting uni in another town, he found himself on a train headed back to her city, her home. It had been Mia's suggestion, and had entirely played into another aspect of who she was.
Game night, just the two of them.
---
"Welcome, to the game room!" Mia announced proudly, throwing open the door to the room she had been preparing ever since she had moved into her own place.
Luc entered it carefully, looking around suspiciously for the inevitable trap.
It actually just seemed like a normal nerd cave.
Mia's dice hoarding was as out of control as usual, taking up several of her shelves. Accompanied by all the usual cages, towers and rolling trays for them.
There was a loop of leather hanging down from the ceiling that seemed out of place at first, until he saw the rest of the virtual reality gear sitting on a shelf to the side.
The table in the corner of the room had inbuilt card holders and settings for placing models. Perfect for tabletop games, like the kind Mia always made him play.
She sprang onto him from behind arms going around his waist as she whispered in his ear, "So... What do you think?"
"You've been productive." Luc acknowledged, "Nerd."
Mia kissed his neck gently and idly fiddled with his belt, "That all you think?"
There it was.
The trap that was always waiting for him any time the two of them ended up alone. Making Luc fight with himself, knowing on one hand that it was incredibly wrong, and on the other that Mia was probably the most attractive girl that he knew.
He tried to knock her hand casually away from his belt, but she firmed her grip, expecting it. Whispering the words he hated to hear, the words that tortured him late at night. "Tell me to stop."
He didn't know how far she'd take it.
He knew that he did want her to cross the line, to keep going. He wanted to experience everything that she kept offering him. Hanging out that temptation.
"You're my sister. You aren't supposed to do things like this."
She nibbled his ear and slid the clasp on his belt open. Practically purring in his ear, "Then tell me to stop."
"S-stop."
Mia walked passed him, spinning around, "So... What are we going to play, tonight? I've got a new one shot that'll waste a couple hours that'd be fun. Pirate themed. Use my brand new table."
She always did that, too.
The moment he did tell her, it was done. Mia never mentioned again, never teased him. She went from total slut to perfectly behaved, and he wouldn't know when the next attack would come. Sometimes months would pass between Mia doing anything. Making Luc feel like it had all just been a bad dream. And then... Then she did something like this.
He wished he could turn the tables on her. Hear her struggle to tell him to stop, but she was his sister. He wasn't willing to cross that particular line.
Which was probably why she felt safe to do what she did to him.
