My Sister-in-Law Is Actually Me

I want to read one where both the top and the bottom are in showbiz. The top is more famous, and the bottom is his fuck buddy, but the bottom always thinks they have no feelings for each other and secretly sees him as a rival. He even uses an alt account to like posts exposing the top's scandals, while being a friendly senior in public, a real two-faced white lotus who's good at acting.

The top is a scheming younger guy too. He knows the bottom doesn't really care about him, and leaves every time after they sleep together. But the bottom is just too gorgeous, and little by little, he falls for him.

One day, the top gets exposed for having a secret boyfriend and accused of bringing him onto the set. The bottom happily goes to watch the drama and even adds fuel to the fire, saying the top is such a tasteless guy. Then he discovers that all the solid evidence points to him: the trip they took together was with him, the matching clothes were ones he'd sometimes left at the top's place, and the hickeys were ones he'd given the top. The secret boyfriend is him?

The top comes out to clarify: Sorry, everyone, it's true. I'm in a relationship, and my boyfriend is the bottom.

The bottom: ???

Probably mostly told through forum posts.

Theme: A sweet little showbiz romance