my heart is stone (and still it trembles) (слэш)

In an effort to get his council to stop forcing the marriage issue on him, Jiang Cheng decides to scare them into submission by marching into Cloud Recesses and proposing to the First Jade of Lan himself. It's a brilliant plan really and there's no way Lan Xichen will do more than laugh at the joke. The council will shut up, Jiang Cheng's marriage annoyances will stop, Jin Ling will get to enjoy some snow, and everything will go back to normal.
So to say he's unprepared for Lan Xichen actually accepting his hand in marriage is a bit of an understatement.
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(A slightly silly au wherein Jiang Cheng refuses to back down, Lan Xichen has a sense of humor, and Jin Ling is a spoiled ball of sunshine. Just wait until Wei Wuxian comes back to life and hears about this.)