To Love is to Destroy?

Jace cheats on Clary on their one year anniversary, causing Clary to run to the London Institute where her friend Luna lives. Soon Clary finds out she's pregnant and gives birth. What will happen when the now top two female shadow hunters (Luna and Clary) return to New York to defeat demons. Clace/Sizzy/Malec. Oh and should Nico be with Luna? Please comment about that.