James remembered clearly the day Lily had yes to being his Girlfriend. He was sure the rest of the school did to since he used an amplifying charm and broadcast the fact from the astronomy tower. He always did go over the top with everything and even though she denied liking it he knew she enjoyed it. Which lead him to his current predicament, asking her to marry him. He just didn't quite know how to top the rest of his behavior. Finally it dawned on him. He grabbed his cloak and rushed past his confused friends down to the hall to set up his plan.
The next morning dawned to a very nervous James antsy to get down to breakfast. He told Lily he would meet her down there and waited for her to walk in with a wand at the ready. Finally she entered and he cast his spell and smiled as it worked. A giant banner hung from the ceiling with a scrawly script with the words "Lily Evans will you Marry Me? Love, James" that was dropping harmless little heart-shaped glitter on everyone.
He gave her a large goofy grin as she turned bright red as the entire hall looked at her. She slowly broke into a grin and ran into his arms and gave him a kiss. "Yes!" She announced to everyone if they didn't guess right yet causing most of the audience to break into applause. She returned the favor when she found out she was pregnant though. She convinced a Quidditch announcer at a game they went to, to state at the end of an announcement "Also, James Potter, I hope you don't mind changing diapers because your wife is pregnant!" Causing him to break out in a random cheer in answer to her smile. Wasn't really pay-back she supposed, but it was just as flashy.