You are Dean Winchester's girlfriend, and a close friend to his little brother, Sam. You and Dean have been dating for three years now and you know all about the life he leads. He often lets you join him and Sam on a hunt, but if the hunt is too dangerous, he makes you stay in a motel you rent near the area of the hunt.
You and Dean are inseparable, you hardly argue and are the happiest when you're with each other. Dean always seems like a sarcastic, cold hearted loner to everyone, but to you (and Sam), he's a sweet man who cares about everything and does everything out of love.
When you, Sam, and Dean were filling Baby's tank with gas, Dean got a call. He face turned to one of surprise and hesitation as he answered the phone and spoke to the person on the other side. After hanging up, Dean filled you and Sam in about the phone call. He said that was his ex-girlfriend, Cassie, calling. She told him that her dad was attacked by a ghost and needed his help to defeat it.
Cassie was Dean's first love. They dated as teenagers, but had an awful falling out. They broke up after Dean told her about the life he lived- about the monsters that are hiding in the dark. She thought he was lying and making an excuse to break up with her. She never got over him.
You, Sam, and Dean made their way to Cassie's place. You were hesitant about this. You didn't want Dean around his ex-girlfriend who was his first love and who possibly still has feelings for him. But you never told Dean about your worries because you knew he'd tease you about your jealousy.
Dean rung Cassie's doorbell, and a few seconds later, she answered. Cassie's eyes filled with love and yearning as they locked on Dean's,
"D-Dean.."