Sequel to Jonathan's Victory

A Clary and Sebastian FanFic I know Clabastian isn't something most people ship but no hate please

Alternate ending to COHF. What would it be like if Sebastian won. (Sequel is called The Morgenstern Legacy.)

When Jace breaks Clary's heart by hurting her and cheating on her the broken girl races to Idris. There she finds Sebastian and reunites with him and discovers he is not her brother and they unexpectedly fall in love. But danger is never to far behind as Jace learns of Clary's escape to Idris and goes after her, starting a war between him and Sebastian as he's willing to fight for her until Sebastian is eventually dead; and Valentine is back for revenge and wants to start another uprising along with his son (Jace) and some newly led Shadowhunters. Can Clary and Sebastian stop this war alone? Or will their love save both sides of good and evil?