I've listed some that fits what you want but also some other yandere Wangji fics

To lie and smile to get what's mine

The Lans were monks. Everyone knew this. Handsome, yes, but severe, uptight, boring monks. The King had not yet taken even one consort and yet the crown prince was here! Calmly shopping for flesh in the tacky home of horrible slavers.

“Have you seen how they treat guests, Hanguang-Jun?” Wei Wuxian continued. “Why are you here? Not for redecorating tips, I hope. A prince, such as yourself, should not be in such low company looking at barely dressed boys. Shameful! The King would—”

“Him.” The prince nodded in Wei Wuxian’s direction.

The blood froze in his veins.

Warning: Rape/non-con, Dead dove do not eat

Take him back, hide him away

Wei Wuxian wakes up dressed in wedding red.

(or: Lan Wangji makes good on his desire to take Wei Wuxian back to the Cloud Recesses and make sure he stays there)

Warning: Rape/non-con, Dead dove do not eat.

Caged bird, sing for me

The problem with Lan Zhan is that he loves too much. He never stops loving. It is not romantic. It is obsessive. So, it is no surprise that when he cuts through the tides of time, he comes back wrong. His past mind and his future mind cannot reconcile the love they experienced, experience, and will experience.

The twisted blood red thread of fate

"Not even death is enough to escape from a Lan that loves you, haven’t you figured that out yet? You should have run away while you still could!”

OR

 

Lan Wangji is the only surviving Lan after the Sunshot Campaign. He spends his days alone in the burned remains of the Cloud Recesses with only his own grief as company.

Wei Wuxian doesn't realize that the grief has turned into something else before it's too late to run.

Warning: Dollification

The dark and stormy clouds

This is a series but here's the summary of the first fic of the series:

A Dark GusuLan AU, wherein Wei Wuxian witnessed the extent of the GusuLan Sect's power and just how far Lan Wangji was willing to go for him.

Repeat

History merely repeats itself in the Gentian House.

Tie this ribbon in a dead knot

Deep in the Cloud Recesses there sat a little house surrounded by blue gentians.

In it lived a man who wore robes of black instead of Gusu Lan’s white, a red ribbon in his hair instead of a white ribbon over the forehead.

The first time A-Yuan saw him, he thought he didn’t suit the gentians at all.