Edward
It was fairly obvious to Edward - even if he hadn't have been gifted with the ability to read the thoughts of others - that Carlisle was completely taken with Esme.
He was startled at first by how easily Esme had adjusted to her new life as a vampire. But the longer she stays with them the more he slowly pieces together the darker parts of Esme's past; the parts that fill him with unadulterated rage at the thought of her husband, and the abuse was done by his hand.
Because Esme was a rare soul; one filled with the same sort of kindness found in Carlisle.
He would watch them in the beginning, completely amused by the way they danced around one another, always believing that the other didn't harbor the same caliber of feelings. Esme's once innocent crush on the kind doctor who helped her teenage self had blossomed into something different.
And in Carlisle's case he was beyond enamored by Esme and almost everything she does. Even Edward himself had to admit her kindness was infectious at times, and it breathed a new life into Carlisle, so to speak.
"I'm in love with her, aren't I?" Carlisle asked him one night.
"I'm afraid so." Edward had told him, and that was the end of the conversation.
He watches out the window of their most recent home - deep in the mountains of West Virginia - as the two of them return from a hunt. Esme has a firm grip on Carlisle's hand, and he could tell by his fathers facial expression (let alone his thoughts) that he perhaps was even more smitten with her now than he was when they left.
He wondered if Carlisle knew just how lucky he was that Esme loved him back.
Rosalie
She hated Carlisle.
Maybe she didn't hate him, but she didn't particularly care for the person who damned her to to this life.
Edward she actually thinks she may hate, and she wasn't shy about reminding him.
Esme was a different story.
Perhaps it was because Esme was uniquely kind, or because they related to one another in ways others would never understand. They both were forced to carry the burden of the men that hurt them, and that something Edward nor Carlisle would ever fully know, despite what Edward may think after listening to her thoughts on it.
She wasn't shy about reminding Carlisle how much anger she harbored. Maybe one day that would fade into acceptance, but she doesn't see that happening anytime soon. The only time she finds she doesn't dislike him so much is when she sees him interacting with Esme. Of course they were almost always together. Save for when Carlisle was at work, they were practically conjoined at the hip.
And even though she would never admit it aloud, she's grateful for Esme's sake that Carlisle seemed to be the antithesis of what Esme's first husband was. She didn't harbor many positive emotions for the doctor, but even she could look upon him and see a man who would never harm his other half.
"You aren't allowed to judge me for what I've done." Rosalie had told Carlisle after her she disposed of Royce, "I don't care if you think it was wrong of me to kill them, it's what they deserved."
"I would never judge you for that, Rose." He had said, and the sincerity in his voice only served to irritate her more.
"No, of course you wouldn't." She hissed, "You're to much of a saint for that."
"I'm far from a saint."
"Says the man who has never been tempted." Rosalie sneers, "You don't know what that feels like; how primal that urge is. You've always been just that much better than the rest of us."
"Oh, I've been tempted."
Rosalie scoffs, "Ha, when you have you ever been tempted?"
Later, she would learn that she was the only one of his children he ever voiced the confession too willingly.
"When I learned of the cruelty Esme suffered at the hands of her human husband," Carlisle had said, "I know temptation, Rose. I would have killed him without a second thought if I had been able."
It's enough for her to acknowledge that he values Esme more than he values his soul, and she knows the weight that holds.
She still doesn't like him, though.
Emmett
He never really understood Rosalie's dislike of Carlisle.
Well, he did. In the way that it made sense to him why she had so much anger for the man. He knew that she resented being this, being frozen in time. Not that Emmett would ever complain, changing Rosalie ultimately led to him being changed. If it weren't for Carlisle biting Rose, he never would have met her, and that's something he can't quite comprehend.
He did, on the other hand, understand why she instantly liked Esme. She was warm, in a way that reminded him of the mother he had in his previous life.
"He's very good to her." Rose had said once, early into the days after his transformation, "And she loves him more than anything, even more than Edward and I."
Rosalie rarely said a kind word of their creator, and so he took it for truth.
He wasn't much for romance. Not when he was human, at least. It was never something he ever thought to care about. Rosalie had changed all that, because she made him want to do those things for her.
So he watched Carlisle and the way he interacted with Esme.
Sometimes when Emmett catches the two of them simply beaming at one another he feels like he's intruded on something too private for the world to see, despite that it was the furthest thing from intimacy. And yet, it intimate all the same.
They were always together, Carlisle more often than not seeking her hand with his own. He was holding her hand constantly, as if he were afraid she would vanish all together if she let go.
And lucky for Carlisle it seemed Esme was just as eager to do the same.
And while they were a bit more reserved when it come to open displays of affection, he spotted Carlisle more than once catching Esme when she was least expecting it and pulling her into a quiet kiss.
Anyone who saw them together for more than a minute could see how deeply in love they were.
He hopes he and Rose can have that.
Alice
She had seen flashes of them in her mind before ever meeting them; small glimpses of the kind hearted doctor and his wife. Carlisle and Esme came as a set, something that Alice found both endearing and comforting. It was the same for her and Jasper; always together.
Esme was perhaps even more inviting than Carlisle - who himself was nothing but gracious - when they arrived. There was such a warmth and mothering touch to the woman that Alice suspected even a human would feel nothing but comfort when around Esme, despite that everything about their nature means it should be the opposite.
"I like them." She overheard Esme saying to her husband in the days after their arrival.
The two of them were in the woods, strolling along between the trees at a notably human pace, hands intertwined.
"I must agree," Carlisle says, "It's a rarity to come across others with our diet."
"We should keep them."
Alice wonders how quickly Esme came to that decision after their arrival.
"Will it make you happy?" Carlisle had asked.
"It will."
"Of course then, love." Carlisle had said, and it was clear to Alice that he would do almost anything if it meant making her smile.
Jasper
Esme and Carlisle were different than others he had come across.
Their bond was something unique in comparison to the other couples he's come across.
There was Rosalie and Emmett, for example. Jasper could feel beneath Rose's icy exterior or Emmett's carefree attitude that there was a true and deep love between them.
And while Carlisle and Esme certainly had the same type of unfading love for one another as Rose and Emmett, there was something about the depth of their connection that was new for him. It felt a bit more pure; more spiritual in a way. Its perhaps the most tangible thread of emotion between two people he's ever been able to trace with almost no effort. It wasn't needed, he could feel it anytime they were together.
He takes it as a testament to just how strong their bond is.
Whenever Esme was around she radiated joy; as if she hadn't a care in the world. He knows from both Edward and Alice that her time as a human was plagued with sadness and abuse. Perhaps its why she embraced this life so happily.
Whenever Carlisle entered the same room as her however, her mood always went from her normal cheerful demeanor to almost deliriously happy. Sometimes it felt all consuming, particularly in the first few moments the two of them spot one another when Carlisle arrives home. One minute all is calm, the next everything around the two of them swarms with the purest kind of love.
"Did you have a good day, love?" Esme would ask, as natural as any human would greet their spouse.
"Better now that I can spend the evening with you."
He doesn't think there are two better souls in the world.
Jasper is thankful for it every day.