I like the story, but it needs some polish to really be good. Your phrasing and syntax is atrocious, is english not your native language?
Tracy and Daphne are interesting but I think things are moving a bit too fast.
Whatever you do please avoid the knockturn alley/trunk/pensieve/time turner shopping spree cliche. Have the girls get him some nice clothes, and maybe a portkey charm bracelet for safety but leave the cliched, recycled plotlines at the door.