The future of a heart

Written for the secret Santa exchange for hetep-heres. the prompt was : 17-years-old Sybil falls asleep in her nice bedroom in Downton Abbey. But the morning after, she wakes up in a very simple flat in an unknown city. And what is the new chauffeur doing there, dressed only in a pair of trousers and a bodyshirt? ("Erased past years" or "foray into the future", you choose!)