Frozen Devotion A High School DxD Fanfic

Severin Lucifuge-younger brother of the legendary Strongest Queen, Grayfia-gave up a life of power and prestige in the Underworld for one purpose: to serve as Rias Gremory's personal butler. For three years, he's anticipated her every need, perfected her tea, and guarded her comfort with quiet, unwavering devotion.
There's just one problem. Severin is hopelessly, desperately in love with her.
But you'd never know it. His face is a mask of ice, his pale blue eyes cold and unreadable, and everyone-Rias included-just assumes he's a brilliant, dedicated servant with zero personality. He's perfected the art of looking completely unaffected while internally falling apart.
He's content to suffer in silence... until Issei Hyoudou shows up.
Suddenly this loud, perverted, utterly ordinary human is getting all the warmth, smiles, and easy closeness that Severin has spent years convincing himself he doesn't deserve. And his quiet resentment toward the new pawn starts bubbling dangerously close to the surface-even as no one notices, because, well, ice doesn't show cracks easily.
Follow Severin through every episode of High School DxD as he serves, suffers, silently seethes, and slowly-painfully-starts to wonder if martyrdom was ever really love at all... or if it's time to finally say something.
Before it's too late. Or right on time.