"Buffy, what's going on?" Willow asked, keeping her at bay with her magic.
Buffy lowered her stake. "Guess you're human in this dimension" she gestured at the unconscious figure of Dawn on the ground. "This Dawn is from my universe, she's a vamp. Came here via a portal to try and get away from me. I'm going to take her home and keep her in a cage" She pointed to a comatose Buffy, blood still visible on her neck, a tranquiliser dart from the alternate Buffy's rifle in her chest. "She must have sired your Buffy". She gestured to a dead looking Dawn on the bed, blood smeared around her mouth, "Who sired your Dawn" She offered them the stake "I'll kill them if you don't want to"
Willow and Tara looked at each other aghast. "We don't have to kill them" Tara declared.
"No" agreed Willow, " We can resoul them"
"What?" alternate Buffy asked incredulously.
"No" said vampDawn refusing the chalice of Mohra demon blood. "I need to make up for all the harm I did, I need to be strong enough to fight if we're going to turn our Sunnydale into a paradise like yours"
Buffy couldn't help grinning. She liked Sunnydale but a paradise? She supposed it was what you compared it to.
"You already gave me my soul back" vampDawn continued, "That's more than enough"
"And you gave me back my sister" Buffy's doppleganger wrapped her arms around vampDawn's shoulders'. "I can never repay you"
Dawn embraced her mirror image, Buffy hers. Willow stood back a little, putting away her magical apparatus. They looked so alike yet so different. VampDawn the image of Dawn but a little younger, obviously having been sired earlier in the timeline. Buffy's double scarred and cynical, reminiscent of Faith but with hope now shining in her eyes.
She conjured a portal and the pair stepped through it hand in hand, waving as they returned to their own dimension, vampDawn covering herself with her coat in case she emerged into daylight, alternate Buffy helping her. On their backs a pair of rucksacks laden with Mohra blood and Orbs of Thesula.
This universe's Buffy stroked the bandages around Dawn's neck, licking away the last traces of Mohra blood from her own lips. "Sorry for…well, you know, biting you and siring you and everything"
Dawn shrugged. "You were a vampire, it's what they do. Besides, it's nice to know even when you were undead you still wanted us to be together"
Buffy smiled. "Even then I thought of mom, that I'd promised to take care of you, even if we were both vamps"
Dawn took her hand as they walked behind Willow. "I guess love really does overcome all"