in 6th year after battle at the ministry in which voldemort was killed for good(Serius can be alive or dead)
Draco is some kind of creature (probably veela)submissive and harry is his mate. he needs harry or he will die
when harry is told he says no at first but concedes when told Draco will die otherwise
everyone tries pushing them together saying how wonderful it was despite knowing that harry doesn't really want this and is mostly doing it to save Draco s life
he doesn't take it well though and starts lashing out his anger ,hurt, and frustration building more each passing day with each remark on how greatit was.
Draco has to bare most of it as they can only be so far apart for so long and everyone else is trying to give them time and space to get to know each other while still being there.
eventually he(Draco) can't take it anymore and tries to commit suicide(jumping from the astronomy tower) his creature thinking his mate is rejecting him but is saved by ???(passing students, teachers on patrol, ) and ends up in the infirmary
this gets everyone mad at harry with Hermione yelling at him that they were disgusted by his actions how dare he treat Draco that way
this causes harry to snap, there's only so much one person can take before they snap and harry has endured more than most he laughs a full belly laugh a bit hysterical when asked what was so funny he doesn't yell he gets cold as if he doesn't have any feelings at all he answers my own damned naivety I thought that now that voldemort was dead I could finally be happy and have my one wish the one thing that stopped me from slitting my wrists when I was 9 (people that loved him) that I could have a life an actual life but no I'm still expected to give everything to everyone my wish gets trampled in the dirt and what do I get people I thought cared for me telling me how great it was despite knowing that I don't want this and am just trying to save his life and of course you don't even bother to ask why I'm taking it so bad I'm just expected to give and give and give: my childhood gone to abusive relatives, murder attempts, and war well guess what I'm tapped out I have nothing left to give I'm not some puppet or weapon for you to use or berate when I don't fit your expectations perfectly I'm done trying to make everyone happy at the cost of myself you want a puppet find someone else.
and leaves everyone behind to go to the infirmary where he picks up Draco and returns to their rooms he apologizes for lashing out at him knowing it wasn't his fault and that he was the easiest target of those involved and that he shouldn't have taken advantage of his(draco) situation and asks to start over Draco agrees and harry casts some spells to keep everyone away (exceptions can be made eg poppy and severus)
everyone else is stunned by his words to them and doesn't know what to think or do
(bash them or not they can be totally innocent)