The Fray Sisters(Season 2)

Jace's departure with Valentine creates upheaval in The Institute; the arrival of Victor Aldertree hampers Alec, Isabelle,Clary and Cassie's plan to rescue Jace; Jocelyn, now awake, tries to catch up on events.
Clary returns to the Institute after she receives a text message from Isabelle "Izzy" Lightwood, saying that Jace had angered the Inquisitor and has been imprisoned in the Silent City awaiting trial by the Sword to determine if he is telling the truth about whether he is in league with Valentine. While sitting in his cell, chained to the bars, Jace hears something attacking the Silent Brothers and soon discovers that Valentine has come and killed the Silent Brothers to obtain the second Mortal Instrument - the Mortal Sword.

Cassie,Clary, Izzy, and Alec respond to a distress call from the Silent City, only to discover that the Silent Brothers have all been slain. Clary and Cassie free Jace using an amplified version of the opening rune that appeared to her amidst her panic. The Inquisitor appears, along with a large group of armed Shadowhunters, and accuses Jace of helping Valentine, since he was supposed to go on trial by the Sword which is now gone.

Magnus Bane is called to the scene by Alec, and offers to keep Jace as a prisoner in his apartment, while he and the others try to figure out Valentine's plans. Jace soon receives a surprising offer from the Queen of the Seelie to visit her court. Jace goes with Cassie,Simon, Izzy and Clary. The group tries to convince the Queen to aid them in the defeat of Valentine. The Queen says she is not sure if she will help and also mentions how their court knows deep secrets, like how Jace and Clary are their father's "wonderful" experiments come to life. The group becomes confused and decides to leave.
And There are two new characters Sean and Maia

Will Sean fall in love with Cassie??Or Alec???

Is sizzy happening or Saia??