First Encounter: S5 Ep12.
"Kid, c'mere," Glory commanded, raising a hand and snapping her fingers imperiously to the unseen girl behind her.
Dawn froze, unsure of her next move. She looked to her sister, instinctively, for guidance. It was clear from their posture that this was the beautiful demon that Buffy had been struggling against.
"Not asking again," came the impatient demand. Her tone was similar to the condescension Dawn was all too used to hearing from Buffy and her friends, but there was something else in the woman's voice that was familiar. Almost comforting, like a smell from childhood that brings a memory with it.
Dawn set her shoulders and walked around the seated intruder, turning to look down at her only once she made it to the center of the room.
The sight that greeted her was as unexpected as it was breathtaking. Sitting casually in their living room was the most gorgeous woman Dawn had ever laid eyes on. Buffy had said that Glory reminded her of Cordelia so Dawn had expected her to be attractive but nothing so grand as the woman before her.
Luckily, one skill Dawn had picked up over the years was an impenetrable poker-face. It was a useful talent to possess when one was prone to being kidnapped on a regular basis. It was never good to let a captor know they intimidated you, it tends to bring out the worst in Vampires and the like.
Dawn had slid into an expression of contemptuous boredom before she had even set her eyes on Glory, and wasn't about to let it slip. No way was Dawn going let an overblown Baddie-Of-The-Week know that she privately thought that she positively radiated scrumptiousness.
Glory, for her part, had no kind of poker-face at all. Her eyes widened at the sight of the Slayer's little sister, and an almost goofy smile blossomed on her lovely face.
"Well you are just the darlingest thing I ever did see in my life!" she cooed. "What's your name honey?"
"Dawn,"
"Dawn, did you know your sister took my key, Dawny, and she won't give it back?" Glory took a breath, watching the face of the captivating child while listening to the Slayer's heartbeat accelerate. This little sister was a definite pressure point for that mousy blond nuisance. "I bet you know where she put it, don't you?"
"She doesn't know anything," Buffy interrupted, rather predictably. Glory didn't even have to prod Dawn, she could sense offense pouring off the teenager like perfume.
"I know some stuff," Dawn objected.
"I bet she takes your stuff all the time without asking, doesn't she?" Glory wanted to keep the conversation close to the matter at hand, and hammer home the importance of the Key to this new player. If sibling rivalry ever grew into something more malign this human cherub might just hand her the Key on a bloody alter. "Where's my Key, Dawn?"
"Go upstairs, Dawn," The Slayer's command was barely more than a whisper.
Dawn couldn't believe she was being dismissed again. "You're always talking about stuff I'm not supposed to hear," Dawn wanted to throw the words in her sister's face. All anyone was doing was talking, and still she had to leave. Unbearable! "I'm going to figure it out you know!"
"Oooooh, I like her!" Dawn could hear Glory saying as she left, the unexpected praise crashing into her like a wave of pure delight. Dawn made a point of not looking back at her as she stormed off. Glory must be some kind of empathy demon or charisma demon or something, Dawn reasoned, making people adore her before punching them into oblivion.
So Glory is looking for a key, and Buffy is keeping a secret. Dawn was no fool. She had helped Willow with the research and the book hunting enough over the years, she knew how to uncover the truth as well as the next scooby. She would get to the bottom of it. That will teach Buffy to try and shut her out.