Harry Desperately Tries to Cling to Sirius
On the last evening of school, [Harry] is packing when he notices the unopened gift that [Sirius] had given him - a [two-way mirror] to use in case he needed to contact Sirius. After a failed attempt at using the mirror, he gets another idea instead and rushes downstairs.
Rushing downstairs, [Harry] seeks out [Nearly Headless Nick] to ask about the possibility of [Sirius] becoming a [ghost], but Nick is unable to offer any help, leaving Harry disappointed.
The Journey Home
[Harry] stands alone outside the [Great Hall] when [Luna] walks up, and they talk for a bit about [Sirius] and about [Luna's mother]. Inexplicably, the conversation makes Harry feel a bit better, even as Luna walks away.
The trip home on the [Hogwarts Express] is uneventful, aside from [Malfoy], [Crabbe], and [Goyle] getting transformed into slugs by members of the [D.A.] when they try to attack [Harry]. Although, Harry does learn that [Cho] is dating [Michael Corner], and [Ginny] [Dean Thomas] (drawing a reaction from [Ron]).
Back at [Kings Cross] once again, [Harry] is made to feel better by his guard of [Moody], [Tonks], [Lupin], the [Weasleys], and the [twins], who threaten the [Dursleys] to take good care of him over the summer. Finally, Harry walks off, Dursleys in tow, ready to face another summer.