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The Wolf in Sheep's Clothing by halcyon1993 

When Derek Hale first presented as an alpha, he discovered that he was special. He could bend people's minds to his will. Years later, he has everything he could ever want—except for the pretty little omega who lives across the street.

Got My Eyes on You by Endellion 

Stiles moves into town and Derek wants him.

Obey by DarklingDarling

Stiles, kidnapped in the middle of the night by Derek and his pack, is kept locked away as Derek’s captive, forced to be taken against his will every night by the alpha. Derek only wants one thing, and he will do anything in his power to get it, no matter how long it takes… Stiles Stilinski as his mate.

Stability by stylemylifebunny

A pack needed three key things for a good standing in the supernatural community: a big strong leader, a secure and loyal pack. A quick way to demonstrate this is through the Alphas virility, in other words, a successful breeding. Wolves only bred in the wild if there are enough recourse and they are not under threat, ergo this shows other weres that they are secure. Derek, Derek had Stiles.

I am not sorry, it is a lie by LunarLacrimosa

There's old stories. Dark tales of forced love and forced turnings. Of sexual copulation that would almost guarantee a human turning; the bite had a risk of being denied because a human was rejecting what was happening to them. Usually the human had no idea that they could reject anything with copulation—if it happened to be forced there was the rejection of the act itself, but not of the change. “I didn't know.” Stiles raises his gaze to meet Derek's own, honey brown eyes resigned but not betrayed. “I'm sorry,” and he supposes he should be grateful that Stiles couldn't pick up the tick in his heartbeat that would give him away just yet. “I know this isn't what you wanted.”

Moulded Into Something Perfect by SinQueen69 

Derek was pleased to finally be enacting a long-term plan he had created, something dark and twisted had taken hold of him. He finally has Stiles and Derek will mould him into perfection.

Full Moon Hunger by Therefore_dubious (orphan_account) and that entire series

It's when the moon is high that he feels the hunger.

Perks of Being An Alpha by SinQueen69

Being a pack-less Alpha had its drawbacks, but it also had its perks.