Ashton: he would do it around December so it would be snowing. He would take you to a beautiful bridge in his hometown were he'd do his prom proposal.
Calum: he'd take you on a cute little picnic around April when it's was warm and the flowers were bloomed. He would tell you to "look at that bird" and when you turn around be on one knee with a box of doughnuts.
Luke: him being the breadstick boy would order pizza for you two and when you open it in pepperonis saying "will you go to prime with me , y/n?" Then celebrate with pizza.
Michael: he would put a ring on your controller and then ask you to play video games. He'd freak out saying there was something on your controller making you angry but then realizing it was a ring and freaking out but he explains it's not marriage it's for a prom proposal.
