Fake dating is a romance trope in which two people pretend to be a couple for a practical reason, to fool a family, a boss or an ex, and gradually realise the performance stopped being one. The best moment is when neither can say what is still pretence.
The trope runs on permission. Because it's all an act, they're allowed to hold hands, kiss in public and wake up in the same room without admitting anything to themselves. The lie told outwards becomes the truth inside, and that shift is what readers come for.
Look for rules, often literally written down. Look for an audience that needs convincing. And look for the one kiss that wasn't for the audience, which both of them notice and neither mentions.
The catalogue doesn't currently hold a story built on fake dating in its pure form. The nearest cousin is the borrowed identity in “The Mask of Signorina”, where you spend a night in another woman's dress, mask and name. If you want the real thing, a world of your own can be built around it: the arrangement, the rules, the audience, and the kiss nobody planned.
At Everglow you do not just read it. You are the protagonist, and every chapter ends with your move.