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Warning: This is a smutty exploration of Buffy's sexuality and her varied partners. Please don't read if you're not of legal age in your country.
The Immortal
Travel let her forget about all the destruction and death she had seen. It let Buffy lose herself in a crowd, anonymous and normal. But she also knew she had a responsibility to her sister. Dawn needed stability, needed to be able to call one place home, at least as best as she could so far from where she grew up. They had already spent several weeks in Rome so Buffy finally stopped running and let Dawn pick a university.
Except Buffy didn't stop running. She alternated between staying in her room alone and disappearing into crowds. One of the times she just stood in the center of a piazza pretending to be anyone she wasn't, another form caught her eye. A man stood just as still as her, letting the world pass them by. If not for the blazing summer sun, the slayer might have thought she was being stalked by vampire.
The slayer blinked and the man was gone, but a heartbeat later and he was directly in front of her, lifting her hand to his lips. Caught off guard by the antique greeting, Buffy let herself be caught up by the mysterious 'Immortal.' He treated her like a princess, showing her the wonders of Rome but never pressuring her for her story or pushing for a physical relationship. Somehow, the blonde felt safe with her new companion and was the first to make a move.
By day, the odd pair pretended to be tourists, anonymous and unnoticed in the massive crowds. And then by night they reviled in more carnal desires. It was as if Buffy put her conscious mind in a box and the Immortal held the key, using his control over her body to wipe all thought of the past and future away. Somehow, the Immortal could take any object and use it to make Buffy beg for more. Before many months passed, the slayer was unable to look at ginger root or anything made of silk without blushing.
But when the blonde woman was somewhere between sleep and waking and felt a masculine arm thrown over her waist, she didn't dream of the Immortal. Come morning, Buffy pushed away the half formed thoughts of past lovers and let her ageless companion take her out of her head again.