"Does it bother you that we're linked like this, Briar?"
"...a little," the fairy softly admits. "I've never done the fairy companion thing before - hardly any fairies ever do. It's a really big responsibility, and you may have noticed that we're kinda tiny."
"'Just big enough to hold one feeling at a time,'" you murmur, quoting - probably badly - a line about Peter Pan's Tinkerbell.
"Yeah, exactly. When happy, laugh. When angry, yell. When hungry, eat. When scared, fly away. That's your basic fairy. But to look after a kid about a thousand times your own size, with at least as much ability to get into trouble and fewer options for getting out of it, you can't go around feeling and acting from moment-to-moment. You have to be able to think ahead, and about somebody other than yourself, all the time. Listening to Mom and her friends talk, it was hard enough doing that when your partner was a Kokiri who never left the Lost Woods, and always faced the same sort of problems day in and day out. In that situation, once you knew what you and your partner could deal with and what you had to avoid, you were good for the next hundred years. Hylians and humans are so much more complicated, and that's just the folks living in Hyrule. In this world, everything's changing all the time, and there are enough demons running around to make it look like the Dark Times come again, when it's really just business as usual. I get the crawling horrors just thinking about that, sometimes."
"That makes two of us," you agree quietly. From the day that you realized who you used to be, you've been constantly aware of just how easy it would be to go down the same path as Ganondorf. Finding out about demons, the Hellmouth, and all the rest of the supernatural truth of the world did nothing to make that particular cross easier to bear - quite the opposite, in fact. On the other hand... "It's easier to deal with that knowledge when you've got a friend to watch your back, though, isn't it?"
"...yeah," Briar agrees. "It is." She pauses, snickers, and continues, "Especially when said friend can turn himself into a giant at a moment's notice."
"Or when said friend knows how to find the weak points in basically everything, and can heal anything this side of death," you return. "Not that I'm in any rush to test the limits of the latter."
"Good to hear."
There is a companionable silence.
"So you don't mind being stuck with me like this, kiddo?"
"As the reincarnated demon lord, I really should be the one asking you that," you counter.
"Didn't we have that discussion once already?" Briar retaliates. "I'm pretty sure we did. How'd it end, again?"
"You mean after the part where you freaked out and hid from me for most of a day, then woke me up at an unholy hour and told me you weren't going to apologize for your reaction?"
"...y-yeah, after all of that."
"Well, I seem to remember it ending with something about friends not leaving friends hanging. And also a threat not to get me anything nice for my birthday," you add, "although since Amy somehow learned enough about Hyrule to give me my pendant - how did you convince her to do that, anyway?"
"It was easier than you might think. I doubt Amy'd ever bought a present for a guy before, and she was having problems deciding on what to get you. I caught her on the verge of going to her mom for advice, which probably would have ended embarrassingly."
Yeah, probably. Amy's the shy, brainy type who's more interested in books than clothes and make-up, while her mother, Catherine, was the head cheerleader and homecoming queen of Sunnydale High back in the day. To say that they don't see eye-to-eye is putting it mildly. If Amy had gone to her mom for help picking out your present, Mrs. Madison would surely have taken it as an opportunity to "properly" educate her daughter in fashion and gift-giving, and you probably would have ended up with something football-related. Amy's mom is kind of obsessed with the sport - well, actually, she's obsessed with cheerleading, and football just happens to be a convenient male-oriented association. She's way worse than your Dad in that respect, who at least has interests in other manly activities like wrestling, boxing, baseball, and motor vehicles.
"Right. Well," you continue, "would I be correct in saying that we both agree that it's not being linked together that either of us minds, so much as the fact that it was the Hellmouth that did the binding?"
"I'd say that's a fair assessment."
"Okay. Fortunately, I can fix that. Give me a day to rest and a chance to pick up some reagents-"
"Wait, what?"
"-and I can have this connection hammered into proper familiar bond-shape in a few hours. If that's okay with you, of course."
Briar's answer is to fly up, grab the tip of your nose with both tiny hands, and stare at you. "You're serious? Absolutely, one hundred percent, I shit you not, I really want to do this serious?"
As seriously as you can manage when you're staring cross-eyed at her, you reply, "Yes."
After a long moment, Briar lets go of you. "Okay," she says. "Let's do it."
From there, your conversation is mostly about the items you'll need to perform the familiar ritual, and what Earth-native materials could reasonably substitute for the traditional Hyrulean ones. Some of it's easy, just simple representations of the elemental powers - a bowl of water, a couple handfuls of soil - but other things, like the essence of Poe meant to symbolize the Spirit World, are going to be a bit trickier. Getting out the phonebook and firing up your suite's complimentary Internet connection, you find several local magic stores that you think are genuine, plus online catalogues showcasing the quality of their wares.