How to get revenge on your brothers: A Guide by Jiang Cheng and Lan Xichen (слэш)

“That’s it. That’s the solution.”
Jiang Cheng opened an eye confused. “What do you mean?”
There was a weird light in Lan Xichen’s eyes and for a moment Jiang Cheng thought the other had gone crazy. “We will make them understand what it feels like seeing their brothers being… intimate with each other.”
(Or: Jiang Cheng and Lan Xichen have walked on Wangxian fucking too many times and plan to get revenge by pretending they're together. It goes as well as you think.)