This was an experiment, based on an idle comment from cofax:
What if it had been Angel chipped in Buffy S4, not Spike?
Somewhat haywire results below. Obviously, it would have
ended badly; I didn't bother to get that far.

Never mind that a Buffy with any sense would stake Angelus 
the moment he turned. Never mind that we've already seen the 
magic trick of Angel going bad and getting into the revenge 
thing.

*****

"Morning, flat tits," was how he greeted her, cheerily, as 
she crossed the threshold of Giles's door. He was still hog-
tied to a ladder-back chair, but the muscle cramps of forced 
inactivity didn't seem to impair his toothy smile. 

Buffy stopped, three steps into the house. She could have 
lived without his saying that in front of Xander and Anya 
and poor, twitching Giles. You know, she could have lived 
without him saying that at all, lived a long time in fact, 
lived to be a blue-haired, cane-walking Slayer without her 
monster ex badmouthing her private body parts publically. 
But this was Angelus. What should she expect.

Hoping the icky silence hadn't been too long, she asked him, 
"How are you this fine, sunny day? Feeling cooped up? Should 
mummy take you for a walk?" They sneered death at each other 
across the room while Giles regrouped the thread of 
conversation.

"Yes, well, I was just saying to Xander," Giles gestured 
with his teacup, so tired he didn't notice that he was 
swilling lukewarm tea in an arc in front of him. "We've got 
to begin considering what to do with this... here."

Xander raised an objecting finger, but Buffy was faster. 
"He's as dangerous as the day he killed Ms. Calendar. We're 
not letting him go."

"No, of course not," said, Giles, his brows furrowing with 
anger. With an emphatic nod, Xander put his arm around Anya 
and raised his finger to interject. Giles continued, "But he 
can't hurt people. He can't even kick a cat."

"He doesn't have to," interrupted Buffy, "he could convince 
the cat it wanted to kick itself. Or induce a cat-riot and 
have all the cats kicking each other's asses. I'm not 
letting him leave this house."

"So he can kill Giles?" asked Anya, brushing Xander's 
upraised finger out of her face.

"Thank you, no." Giles took a seat on the couch, massaging 
his forehead.

Anya sat beside him. "I was just saying."

"I do believe," intoned Xander, raising his finger once more 
as if it were a valiant candle in darkness, "that I made the 
Aha! gesture quite clearly."

"Let the village idiot speak!" Angelus pealed laughter. They 
all stopped to stare at him. He recovered himself, giggling 
and swallowing it, in the face of their collective 
repugnance. "Oh, go on, boy. I'd like to hear your grand 
plan."

"Grand? No." Xander gathered his cool. "It's as simple as a 
village idiot. We wait till Willow gets back from that 
witch-retreat thing, and bam, she curses him again. Problem 
solved."

Wheels were turning behind Buffy's eyes, even as her lips 
pursed to reject the idea. Angelus just stared his cool, 
superior stare, acquisitive black crow's eyes in a ghost's 
white face. "I like your idea," said Anya, nodding. "Good 
thing you're my boyfriend."

"It's a possibility," was all Giles would allow. "Although 
that means I shall be hosting the most dangerous vampire I 
know in my living room for -- what, two more nights?"

"Till Monday," supplied Buffy.

"Don't bother, it won't work." Angelus lolled his head about 
his shoulders. "Whatever it was those military types did to 
me, it pretty much guaranteed I'll never have a soul again."

It wasn't true; but then, lying was both fun and profitable, 
if your currency happened to be that pained look on Buffy's 
face. Not to mention the slow burn that was consuming 
Xander. A smirk twisted gray lips up over those unnaturally 
elongated canines.

"We can take our chances on Monday," decreed Giles, standing 
up to pace.

"It's big of you, to let them operate on your turf like 
this."

"You shut up." Buffy stared at her ex-boyfriend with as 
cordial a loathing as she could manage. "Xander, Anya, I 
need intelligence on these army guys. Who's seen them, what 
they were doing, where they were going, what kind of gum 
they chew. Anything you can dig up." She ushered them to the 
door, sparing one backwards glance of death at Angelus.

Three living, breathing young people stepped out into the 
fine California sunshine and said their goodbyes. Xander 
started out of the courtyard, then turned back to face the 
Slayer. "Buffy..." He hunched his shoulders like he was 
waiting to be smacked. "I, uh, I like your...." He cupped 
his hands in front of him. "You know."

Buffy said, "Thank you, Xander," and watched him realize she 
meant it. He waved off the moment with a grin and a thumbs 
up, just in time for Anya to bash him with her bag as she 
thundered past. Xander chased her, double-stepping with his 
long legs, swooping around her like a sparrow at its nest. 

"I meant in the aesthetic sense!" he wailed, and they turned 
the corner and were gone.

Buffy crossed her arms and forced herself to turn around. 
She imagined the horrible things that could be happening 
right behind that door. He could have gotten free, and be 
force-feeding Giles tea cookies. He could be digging through 
Giles's wardrobe, finding -- something awful, in a really 
tweedy way. But even if he was still shackled and helpless, 
she had to go back through that door and deal with her ex-
human, ex-evil, ex-ex-evil, ex-hellbound, ex-evil, re-evil, 
inexplicably Gandhi-loving ex-boyfriend.

And Giles had already said no staking. Damn.

    Source: geocities.com/veehome