The Origami Unicorn, by CassieIngaben https://archiveofourown.org/works/99540 The story imagines a world in which people can buy a robot designed to provide companionship and sex, matched to the purchaser’s requirements. It’s a similar idea to Tanith Lee’s Silver Metal Lover – but it’s not a crossover. Klaus orders a robot … and gets one that’s far less compliant than he’d expected.

The Iron Metal Lover, by Kadorienne https://archiveofourown.org/works/101435 In a very similar universe, Dorian buys a robot. It’s as beautiful as he’d specified in his order – but it has a mind of its own.

No Moral Consequences by TelWoman. https://archiveofourown.org/works/23224024/chapters/55602322 In a different but not so dissimilar universe, Dorian is a robot.

Mirror, Mirror, by Whizzy and Zaganthi https://archiveofourown.org/works/19890817/chapters/47112121 What if Klaus was the art thief … and Dorian was the NATO major? A good action story involving theft and espionage.

Cold Iron, by Filigree https://archiveofourown.org/works/135427 A long story, with some difficult themes in it – not for the faint-hearted. Klaus has been seriously damaged on a mission; he still looks the same, but his mind is gone. And Dorian is descended from a Faery ancestor. The story has two alternative endings.

Le Bel Homme sans Merci, or, The Unicorn Tamer, by Kadorienne https://archiveofourown.org/works/292081 Faeries exist, and Klaus has Fae blood. He has to rescue Dorian from the clutches of the Fae.

Kiss of Arachne by Kadorienne https://archiveofourown.org/works/99233 Set in the universe of The Kiss of the Spider Woman.

The Fabulousman series by Kadorienne https://archiveofourown.org/series/2103 Dorian gets hit by a meteorite and acquires superpowers. And a cape. Hilarious shenanigans ensue.

Hamburg Man by Kadorienne https://archiveofourown.org/works/99217 Film noir AU. The language is amazing.

Snippet # 27 by Kadorienne in which Z stumbles over the unexpected secret of Klaus’s long hair ... https://archiveofourown.org/works/54031

Complete crack, with Klaus as a football player and Dorian as is a fashion reporter sent by his employer (Mr. James, Esq., of the Tattler) to interview him for the World Cup. Due to circumstances Dorian instead ends up being hired as Klaus's personal massouse. WIP IIRC, but still fun! archiveofourown.org/works/1528868

not available online, but included in the collection compiled by Margaret Price: His Majesty's Musketeer and the German Herr Officer Klaus von dem Eberbach is sent to France to recover stolen jewels. The French sets him up with one of their musketeers to help him. The foppiest popinjay dandy of them all. Not even a Frenchie - but a brit! Lieutenant Sir Dorian Redd. Aka the Golden Blade

Curly Tails and Tusks by Heather Sparrows https://archiveofourown.org/works/667016 Where Klaus and Dorian are pigs!

The Scarlet Eroica by Diana Williams Scarlet Pimpernel AU. Dorian is the Scarlet Eroica and Klaus takes on the Margarette role in the story, with Franco Juliani playing the Chauvelin part. https://archiveofourown.org/works/22148959/chapters/52870573

Bishop by TelWoman https://archiveofourown.org/works/841198