Scott: roses
you loved roses. they were basic but they are so pretty. one night, Scott happened to be out and you were at home cooking dinner. you heard the front door slam and before you could turn around Scott was standing behind you. you spin around to see Scott holding a bouquet of red roses. you blushed, covering your cheeks with your hands. "I love you." his voice spoke up. you took the flowers and stared into your boyfriends eyes. "I love you too."
Stiles: peonies
it was a boring day in Beacon hills. You and your best friend, Stiles Stilinski were sitting alone in a field of flowers. You didn't know what half of them were but you grew a fond appreciation for the pink peonies. You mentioned it to stiles and he picked one and handed it to you. "Y/N, I have admired you from the day we met, you are my sun, will you do me the honours of letting me take you on a date." You were speechless. You cupped the flower he had handed to you and nodded very rapidly.
Derek: lilies
It was your anniversary. Derek had forgotten which pissed you right off. You hadn't talked to him all day and just got off work. When you walked in the front door, petals lined the flooring to your bedroom. When you opened the door, the room was filled with lilies and your boyfriend. He knew your grandmother loved lilies and that rubbed off on you. Lilies were a beautiful way to represent her. You began to cry as he wrapped his arms around you. "Happy 2 years!" He whispered into your forehead.
Isaac: daisies
Isaac had taken you out on a walk. It was through a nice forest behind his house. He and you wondered around for a while when the forest came to a end and the field around you was all daisies. You loved daisies, they were just so visually appealing. Isaac began picking them and picking them. You were confused but minutes later he came back with a flower crown made of daisies. He placed it on your head and stared into your eyes. "You are my daisy queen." He said, embracing you.