All Our Yesterdays (слэш)

York, England, 2120: Yuuri Katsuki is a dime-a-dozen techie, spending his days doing routine repairs at the university. He hangs out with his friend Phichit, goes for a drink, watches holograms. It’s an existence – but is it a life?
Crowood Castle, Yorkshire, 1392: As the son of a baron, Sir Victor Nikiforov makes judgements where lives hang in the balance. As a knight, he must sometimes end them. It’s what he was born to do – but what of the heavy burden on his soul? Death is all too commonplace, while life and love remain elusive.
When a brilliant scientist goes rogue, journeying to the Middle Ages with the world’s first time machine, Yuuri is stunned to be called on as the last hope of preventing her from changing history. After an abrupt departure, he lands at Crowood Castle disguised as an enemy of the Nikiforovs, Sir Justin le Savage – and will need to act the part if he is to survive. It’s a tall order for someone who can barely tell the back end of a horse from the front. But if Ailis, in her own disguise, discovers who he is, his mission will end in a blaze of laser-gun fire. He must not give his real identity away, even to the beguiling knight he’s falling in love with…