Magnus Bane's sister

Magnus the high warlock of Brooklyn has a very good hidden secret. A secret no one ever was able to reveal. That secret is Elisa, his slightly younger but even more powerful sister. Those two have always been really close to one another. Never too far away so they could always help each other out.
Elisa has done lots of deals with shadow hunters till now, not even the heavy distrust her brother has for them made her stop doing so.
How will both their lives turn when Magnus meets Alexander Lightwood and falls head over heals for him?
Will the clave and the Lightwood family allow the building connection? Will Alexander even return the feelings?