kurapika:
kurapika did it formally but quickly (not that quick) since both of you did have work.
he set up a scavenger(?) hunt with letters,poems,quotes. the writing was in your fav color.

when you got home you did the scavenger hunt and found kurapika holding chocolates and a bear.

since his confession was in the last card, you instantly said yes with no hesiration.

hisoka:
his confession would be the opposite of kurapika's. yes, it was a scavenger hunt but it was less formal, alot slower, and painful.

its not in your house....its in the forest and it is raining. it was pure torture, it was dark,raining and SOMEONE IS PIERCING YOU WITH CARDS!

when you finally got out of the hell hole, you saw a familliar looking clown....hisoka... but before you can do anything, you passed out from loss of blood, the last thing you heard was hisoka saying you are mine, no one else. got that?~

illumi:
he just bluntly told you.

chorllo:
he gave you stolen treasures and your fav flower, and he did it while wearing a tux(?).