You were Harry Po-tter's sister and you were Fred Gideon Weasley's girlfriend, you were even George's bestfriend. But today was Valentines day and Fred did many things, he did a picnic at the Black Lake, and buy a ring to propose, in Valentines day.. Incredible.
So Fred took your hand and walk with you at the Black Lake as her show you the beautiful picnic, a white blanket, heart ballons, a basket with a bow, flowers, chocolates, food.. many things.
It was so beautiful and you thank him and hug him and kiss him after you both sat on the blanket and Fred gave you a sandwich and took one too, the velvet box was in his pocket and he even wanted to ask you - while he will propose - If you wanna be a Weasley because you're gonna get married.. if you say yes.