Timeline: BtVS: Post-Chosen & Charmed: 03x22: All Hell Breaks Loose.
Disclaimer: The Buffyverse belongs to Joss Whedon and Charmed belongs to rich people with expensive lawyers.
Author's Note: Written for Day 02 of the 2020 August Fic-A-Day.
A/N: The timelines don't add up, so just pretend that the Halliwelll's have been Charmed for five years instead of three, and then add a month.

After the Battle of Sunnydale, after they recuperated at the Hyperion in Los Angeles, and after Giles took most of the Mini-Slayers with him back to England, Buffy decided to try and locate either of her fathers. She'd known since she was very young that Hank Summers was her adoptive father, and when she had turned 13 her mother had sat her down and told her a little more about her biological father. This had included telling her about her half-sisters.

Her real father's name was Victor Bennett and he was originally from New York City but had moved to San Fransisco in the mid-'60s. He had married a woman named Patricia Halliwell in 1968 and they'd had their first child in late October in 1970. They'd had another daughter in 1973 and a third in 1975 before divorcing in 1977. He'd moved back to NYC two years later.

Over the years she'd had sporadic contact with Victor, but more often than not he'd flaked on their visitation. And as she'd gotten older he'd called her less and less. After Buffy had sacrificed herself to save Dawn and subsequently was dead for almost five months he'd stopped contacting her at all. Most likely believing she'd given up on him.

With everything going on, she'd let it go. Being resurrected in the way she had, and then everything that followed, he just wasn't a priority. But now she was free and able to do what she wanted. Sort of. Giles was trying to rebuild and improve the Council, Willow had gone to England with him to visit the Devon Coven, and Xander had taken Andrew to look for Potentials in Canada. Faith had accepted an unlimited credit card and taken off on a shiny new motorcycle to find Potentials-Turned-Slayers of her own.

There were no limits on the cards all of them had gotten, but Giles had warned them to take it easy and not waste it. Well, he'd used much more stuffy British words, but that's what he'd meant. They were all going to travel a lot in the foreseeable future so they wouldn't be able to carry around large amounts of whatever anyways. It put a downer on all of the new shoes she had imagined as soon as she realized what her former Watcher was handing out.

It did mean it would be much easier to replace anything that was inevitably ruined or entirely destroyed by vampires and whatnot that went bump in the night. That made her very happy. She was sure she could make extra room for a few more pairs of shoes if she made an effort, too.

She did splurge on a new laptop computer and spent a few days trying to locate her father. The internet told her he'd moved back to San Francisco five years earlier and she got upset. It was a six-seven hour drive from San Francisco to Sunnydale. Given how much he traveled for his job it was nothing in comparison.

Regardless, she tracked down his current address and went there. It had been almost two years since the last time she'd heard from him, and he had some explaining to do. Not that she was innocent, she could've picked up the phone as well. According to Dawn, he'd called a few times while she was in heaven but when he didn't get her on the line after three attempts he gave up and went silent.

He wasn't home. A nosy neighbor told her he was on a business trip but the man didn't know when he'd be back. A little frustrated she returned to her rental car and tried calling her biological father, but only got the answering machine. She left a message and then started the car. On impulse, she tried to call Hank Summers while the car idled. She had long since lost count of how many times she'd gotten the answering machine, but on the umpteenth attempt, she left a message. He couldn't ignore her forever.

An hour later she was outside 1329 Prescott Street and what turned out to be a very pink Victorian Manor. She smiled to herself, they had style. Steeling her nerves she opened the door and got out of the car. All of a sudden she felt a chill run down her spine and she immediately scanned the area for anything supernatural and evil, but there was nothing, just a normal street with old houses and well-kept gardens in front.

Not long after what looked like a small tornado appeared on the stairs and blew the doors open wide before moving smoothly inside. From inside the entrance hall of the home, Buffy heard two different women yell "Phoebe!" Shortly after there was the sound of two bodies being thrown on the ground.

As she ran up the stairs a male voice exclaimed, "Dear God!". It was followed right after by a woman shouting, "No!". Then she was inside, and just as the grey-skinned demon was about to use some kind of blue power on the man, two things happened at once. A short brunette pushed the doctor aside and Buffy kicked the grey-skinned, grey-clothed demon so his aim went wild.

To Buffy's right another, long-haired brunette got up off the floor, yelling "Prue!". There was no time for explanations as she kicked the demon again and followed it up with several punches. While she got her violence on, a third woman came running down the stairs with a piece of paper in her hand. The three sisters huddled together at the bottom of the stairs and began reading a spell from the paper out loud.

"Evil winds that blows
that which forms below
no longer
may you dwell
death takes you
with this spell."

When they were about half-way through, Buffy backed away from the demon with a final kick. Soon after it started glowing, and she shielded her eyes as it got even brighter. Even with her eyes closed and an arm over her eyes she saw the bright light wash over the entire room. Then her senses told her the demon had been vanquished.

Chaos followed. A man orbed in, took the man, a Dr. Griffiths, and orbed him back to the hospital where he worked. Then she was alone with the three women, all of whom were looking at her with a mixture of gratitude and suspicion.

"Um, hi?" She tried and gave a tentative smile. Post-kills with an audience were much simpler when she could attempt to give a bad excuse and then leave. But this time she wanted to talk to the people in question. At least the supernatural cat was out of the bag so she didn't have to try and ease into that topic. It wasn't even her fault this time.

"Who are you and what are you doing here?" The little research she'd done both before she arrived in San Fransisco and before that told her the woman was Prudence Halliwell, the elder of the three sisters.

"My name is Buffy Summers." She waited a moment as she looked closely at all three of them, but there was no recognition anywhere. Buffy's heart sank. "I came here to meet the three of you."

"Why?" The youngest of the three asked. "Do we know you?" And wasn't that the million-dollar question.

At the same time as Phoebe asked her second question, Piper asked one of her own. "Are you a witch?"

Buffy answered the second question first, as it was the easiest. "No, I'm not a witch." She hesitated for a couple of seconds. "Does any of you recognize me or my name?" All three of them gave negative replies.

"Maybe we should go somewhere more comfortable before I explain why I'm here. It'll take a while and you'll probably want to sit when you hear what I have to tell you."

There was some grumbling but Phoebe took the lead and left the room. Everyone else just followed.

They ended up in a cozy living room and everyone got comfortable. Phoebe went straight for a large armchair while he sisters sat down on a matching couch. That left the smallest armchair for Buffy.

"We're here, we're sitting down. Now talk."

"I'm here because Victor Bennett is my biological father and I've wanted to meet my half-sisters for years. We've never had much contact, but because of some... stuff, on my part, we lost contact completely two years ago." The three witches just stared at her without even trying to speak. "I assumed he'd told you about me since he occasionally spoke about the three of you, but I seem to be mistaken about that."

They were still peppering her with questions when a shower of blue and white orbs materialized beside the couch, right next to where Piper was sitting. The orbs quickly revealed a tall, blond man who glanced around the room before his eyes scrutinized her for a short time and then he looked at Piper.

"Dr. Griffiths is back at San Francisco Memorial Hospital. What did I miss?"

His eyes once again returned to Buffy, who gave him a small smile. "Oh you know, we were saved by
our randomly appearing younger half-sister, and now we're getting to know each other." Piper quipped back.

The man blinked. Then he looked at his two known sisters-in-law, Buffy, his two sisters-in-law again, and then back to his wife. "What?"

Prue and Piper summarized what they'd been told so far, and then Prue turned back to Buffy. "Did we miss anything?"

"No, that's about it."

"You know about witches and demons, but you're not a witch yourself. You're a mortal?"

"We're all mortal," Buffy replied a little confused at the terminology.

"No," Phoebe interjected, "a mortal, or innocent, is someone without power or who we are here to protect."

"Ah," she nodded. "Then that's a negatory. I have power, it just isn't magical. I lived on the Hellmouth for seven years before it became a sinkhole if that explains it better."

The man nodded, but the sisters looked confused. "What's the Hellmouth?"

"Sunnydale was located on a literal portal to a hell dimension. I was sent there to guard it when I was 15. The collapse a month ago was us closing it for good."

Leo frowned a little, "But there are others, right?"

"Yes, but they're much smaller and not nearly as dangerous as the one in Sunnydale was. We have people guarding most of them now."

"If you're not a witch, then what are you?" Prue again.

"Officially my title is Vampire Slayer, but I kill demons and other evil things as well." Then she gave a short description of her abilities before asking about theirs. That segued right into why she'd been conscripted into the job, which got a little ugly but it was what it was and it wasn't going to change despite there being so many more of them now.

She could see they weren't entirely sold on her being their sister, but they were working on it. They'd had less than an hour to get used to the idea and then there was her Calling, but she had known for a decade.

"I'll go Up There and see if they can confirm it."

"Hurry, we don't have all day." Piper got up, "Actually, meet us at P3. I was supposed to be there half an hour ago."

"Okay, I'll be back as soon as I can." Then he disappeared in the same blue and white orbs he'd arrived in.

"That is a nifty way of traveling if a little showy." It would've been a dead giveaway if she moved like that while hunting vampires at night. It would've temporarily have blinded her while her eyes adjusted to the dark and given whoever was nearby a golden opportunity to kill her. It would've been very useful during the day though.

The rest of them got up and they agreed to meet up in a few days to talk some more. It would give them time to look her up and ask whoever they needed to ask if she was the real deal, including having a long overdue talk with their shared father.

They said their goodbyes and Buffy left in her rental car while the Halliwell's left in Piper's car.