Follow Your Passion: A Seamless Tumblr Journey
Shen twins au where Shen Jiu's qi deviation (the one that killed him in cannon) almost kills him and messes up his cultivation (and health) to the point where he won't be able to act as peak lord. Though SJ, refusing to let anyone knows this (show vulnerability) decides to get someone to cover/pretend to be him. Cut to Shen Yuan, who is a rouge cultivator, being dragged into the role of peak lord (only YQY and MQF know its not SJ).
Everything goes as it dose in cannon though SY dose talk to SJ to give him reports on what's going on. SJ lectures him about being too nice and ruining his reputation but SY doesn't listen.
Anyway, after the immortal alliance conference SJ is finally ready to retake up his role, which is great because SY isn't all there mentally. People chalk the personality change to SQQ grieving. Plus, SJ doesn't feel as terribly about everyone after hearing SY talk about them so positively.
I think LBH reunion with his shizun would just SJ chewing him out for causing SY so much grief. At this point he dgaf about not letting LBH know that him and SY are different people, his twin is hurting. LBH realizes that SY regretted what he did and decides to track down SY. I'm guessing this doesn't go too well but LBH doesn't think SY hates him so they do get to talk at some point
Anyway they get married eventually, SJ hates this