Harry:
Harry knew that when you came along, you were the one. Even if he was still young, he knew. He knew you were the one he'd want to spent the rest of his life with. Which he did. After Voldemort was once and finally gone, he went to you and asked you to marry him.
Ron:
Ron hid the ring in the piece of cake he baked for you. You had no idea so when you bit into the piece, you accidentally choked on the ring before coughing it out. Only to say yes when you saw what it was.
Fred + George:
He had been pranking you endlessly when he stopped and stood on his knee asking you to marry him. You of course thought it was a joke and screamed out a 'No' jokingly. But he looked so serious that you couldn't help but walk up to him and look at him scared.
"I'm being seriou Y/N. I love you ever since I layed my eyes on you. So please. Would you do an honor of making me, the most pathetic pranker in the world, happy?"
Draco:
It happened when you guys were having a picnic in Draco's private garden. Both of you were looking up at the sky talking about th weird shapes of the cloud when it happened. Draco plopped up on his elbow towering your face before reaching down his pocket and taking out the ring. The action surprised you and you could do nothing other than stare at him in shock.
When he asked you to marry him, you pushed him on the floor peppering him with kisses and repeating 'Yes'
Okay. So this is it. I am havin my exams in a bit and i want to finish studying but I feel so bad so here you go