It was fake, everything about them was fake. They both signed a contract, they had to keep up the facade, no matter what happened.
Rose Vettle, and Liam Lawson, both Formula 2 Driver. In which they don't like each other, ever since 2018 where Rose accidentally lost control of the car hitting Liam during the ADAC Formula 4 Championship. She won the championship, Liam coming second. The two were each other's biggest rivals, always wanting to be the best.
Until new year of 2020, where their managers both presented them with contracts, to date. If they didn't sign they wouldn't be getting the resources the car needed. They were both set to race for Hitech Grand Prix, along with Max Fewtrell. The British knew of the contract, and had to make sure the two stuck to it, without telling anyone.
The contract was to be for the year, and the next year weather they were team mates or not, they would have to continue dating. But in 2021 they wasn't dating for the contract, they had forgot about that.
Being together just felt right, they fit together perfectly. At the end of 2021 when they met up with their managers they were told to break the fake relationship off, only it wasn't fake by then. The two fought hard to stay together and did. They told their managers they were staying together, one way or another.
Just because the two are together, doesn't mean they don't get pissed at each other on the track, still being rivals.
Transmigrated into DxD World-Kuoh Town, Hibari Kyoya. an average student, spent 18 agonizing years in the world fully aware of the dangers, knowing he is utterly powerless in a world of gods and monsters, Until...
[Ding! Sign-In System loading... 20%... 50%... 80%... 100%.]
Destiny, it seems.. has a cruel sense of humor. A [Sign-In System], long overdue, finally bursts to life within him, offering a chance at survival, a chance at power...
[Ding! Congratulations! You have received the Rainbow-Grade Gift Bag!]
...
He then started completing System's tasks, accumulating even greater rewards.
[Ding! Task completed. Reward: Perfect Rumble-Rumble Fruit (Weakness to water Removed).]
[Ding! Task completed. Congratulations to the host for obtaining the Flying Thunder God Technique!]