For the third one, I'd recommend That Old Black Magic http://keiramarcos.com/fan-fiction-index/harry-potter/the-war-mages-trilogy/ (http://keiramarcos.com/fan-fiction-index/harry-potter/the-war-mages-trilogy/) This is eventually going to be a trilogy but book one is complete; she's working on other things right now but I re-read this all the time.