What can i get my bf for velentines day?? i want to make or buy somthing memorable!! please help?

weve been dating for 9 months(and even though im only 15 i think hes the one, so please dont tell me im to young) now, and i really love him, so i want somthing that well both remember!! were already gonna go out to dinner, but i dont kow what kind of gift to get, i dont want somthing bland like a hat or to go see a movie. i want somthing new and exciting. and please dont answer with . thanks a lot!! please help, love you all!!!! happy valentines day.