A couple of weeks before Willow's BIG disaster with the "equalization" incantation, Kennedy had hurt Willow. It happened one night when Kennedy was trying out a new position from Willow's very special copy of the Kama Sutra. Without realizing just how strong she has become Kennedy accidentally sprained Willow's left wrist. It reduced her activity for several days. So upset about what had happened to Willow, Kennedy couldn't even bring herself to tell Buffy what happened when she asked Kennedy why she was so distracted the following afternoon. Months earlier, when Kennedy had arrived in Sunnydale she was only 4 inches taller and fuller in the bust and also a couple of cup sizes larger than Willow. Being nearly identical in size physically to Tara made Kennedy suddenly so very attractive to Willow. So while she wasn't in the market for a new bed-mate at the time, Willow's body was subconsciously drawn to Kennedy's. Willow was lucky that Kennedy was immediately receptive to her overtures. Because they hit it off so easily, Willow didn't even consider that things could quickly change between them.
Barely 18 when Kennedy arrived, Willow was seemingly very ancient at 22 1/2. So while puberty had long since past Willow by, it hadn't started working its magic on Kennedy until shortly past her 15th birthday. While it wasn't working full-time on her anymore, that Spring when Kennedy had transformed into a full-blooded Vampire Slayer, puberty had suddenly returned with a vengeance kicking into over-drive on her. Since then she had been gained at least another inch each month in height and across her ballooning bust. When Willow had made her goof with the "equalization" spell, Kennedy had already become a quite stunning 6' 3" tall. She would have proudly worn a 41E bra, if anyone made one that size. Also without realizing it yet, Kennedy had become far stronger than any other Slayer in Buffy's Army. That explained why she had so easily injured Willow. Kennedy was now at a cross-roads in her young life.
Each night she became increasingly worried if this would be the night she again injured Willow. Kennedy reasoned, quite logically, that as she was still getting bigger and stronger every single day, it was only a matter of time before Willow was again hurt during their nightly bedroom gymnastics. AND the next injury might be much more serious OR something permanent. Kennedy couldn't live herself if that happened and yet she also couldn't bring herself to leave Willow. So when Kennedy heard that Astrid was coming and just how big she was, Kennedy began praying that Astrid would be willingly help her with her sleeping arrangements. Having learned shortly after Sunnydale was destroyed that Vampire Slayers can't become pregnant, Kennedy will be shocked to learn WHY it's taken Astrid so long to come to Scotland. She has no inkling that Astrid has been extremely happy being a Mother.
The reason it has taken so long for Astrid to arrive was she refused to leave without her family OR best friend. During Christmas break while in 9th grade, a new family moved into her triple cul-de-sac neighborhood. It was kind of an unusual family. The two oldest kids were both in the 9th grade but step-siblings. Everyone of the 10 kids (no multiples) had at least one full sibling except for the boy. Consequently in a house full of kids he felt alone. Skinny as a rail and not yet that tall he looked to be out of place in High School. If he hadn't been placed in 2 of her classes for the rest of the school year, Astrid probably wouldn't have noticed him at all in school. So when he asked her to the High School's Halloween Party, she turned him down. Astrid figured he had been talked into playing some kind of prank on her by some of the kids she had seen him talking to just before he asked her. Already a little over 6 feet tall, at that time she was nearly a foot taller than him. A few days later, her older half-sister Julia told their father about the boy's Halloween invitation and he insisted that she go back to him and accept it. He even gave her permission to fight back HARD if the boy tried any funny business with her. So she was quite surprised over how gallantly he treated her at the party.
Two days later, Astrid heard he had been sent home after being in a fight. She never did find out about it but a couple of much bigger boys than him had asked him how "good" she was in bed. To cheer him up, she went over to his house after school. When Astrid asked to see him his step-mother said he wanted to see no one so she left right away. Suspended a week for fighting (throwing the first punch in front of a teacher didn't help) he was in no mood to talk to ANY one from the High school. It took her several days but his step-sister Nerissa finally convinced Astrid to visit after Thanksgiving Dinner. The match-maker's efforts worked out far better than she expected. By Christmas break they were dating and it was only 14 months later on February 29th during their Junior year when they married.
That year they had an early Christmas present, because on the Winter Solstice their twin daughters were born at her home, healthy and full term. When they had married it seemed more sensible to everyone that he move in with her family. This way they DID have a lot more opportunity for privacy. Which explains why the girls came along so soon after their marriage. While she didn't have any chance to be Homecoming Queen, Astrid was the surprising choice for Belle of the Junior/Senior prom. So a couple of years later when she was suddenly transformed into a Vampire Slayer, Astrid was by far the most resistant one to join Buffy's Army. Like several other potentials who happened to be pregnant when they unexpectedly became Slayers she had gone into premature labor. If Astrid hadn't been living such an healthy life-style her daughter would've surely died. As it was, her daughter spent nearly 2 months in the Hospital before being released weighing just over 6 pounds. That summer her husband needed to take 2 final classes to earn his Associates Degree which they really badly needed for their future. So 4 days after his last final, Astrid's family along with her best friend were packed for Scotland. Arriving on that fateful day, Astrid had absolutely no clue about what would soon happen to her.
Astrid had been lucky her husband Harold Tallman (ironic name) at grown to be 2.25 meters tall, ending up less than 1 1/2 inches shorter than her. He also filled out quite handsomely and they both now weighed 22 stone. {308 pounds or 140 kg} Interestingly, once they were living together his body really started growing up. It almost seemed as tho Mother Nature WANTED their bodies to be fairly close to the same size. Seeing Faith on their arrival, Kennedy was notified about their newest recruits arrival. While the rest of her group were being shown to their new quarters, Kennedy took Astrid to her fateful rendezvous with Willow. When the incantation unexpectedly engulfed them along with Buffy, Dawn and Willow, Astrid instantly thought, "Maybe, I should have turned these women down, after all." So when things cleared up and Astrid didn't seem changed, she relaxed a little.
However that really wasn't the case, at all. While the spell had been a disaster as far as Buffy AND Dawn were concerned, the silly thing had worked perfectly on Kennedy and Astrid. Kennedy was now 7 1/2 feet tall with a body identical in size and every other way to Astrid's. Realizing that she's just grown another 15 inches taller Kennedy nearly faints from joy. With Willow now unconscious and not knowing how long before she'll wake up from the effects of the spell, Kennedy hastily asked Astrid for her help. She figured that Willow couldn't object if Kennedy offered to share her room [ahem, bed] with Astrid while she settled in. Incorrectly assuming that ALL Slayers were lesbian, Kennedy couldn't fathom why Astrid slapped her to ground with a very forceful "NO WAY!"
Now crying worse than she had since she was 3, Astrid instinctively hugged Kennedy. Which only confused her more about Astrid. Kennedy then broke down and spent over an hour spilling her guts to Astrid telling her EVERYTHING, about her really "close" friendship with Willow. Now seeing the pain Kennedy is suffering Astrid offers to help her with at least some with her problem. Kennedy instantly cheers up again wrongly assuming Astrid will share her bed. Especially when Astrid asks Kennedy to take her to her room. After hitting her head on a couple of doorways [Astrid's home had 9 foot or higher ceilings, both upstairs and down], she remembers to start ducking. So now she tells Kennedy to stay there and DON"T undress while she goes for a walk to think things through. About half an hour before Willow is finally wakened by Faith, Astrid has come up with a solution (of sorts) for Kennedy's problem. Within minutes she willingly but reluctantly accepts Astrid's offer. This is why Kennedy told Willow she was leaving her so abruptly.