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Stiles has come to realise he's definitely bisexual
The subject of his realisation is one sourwolf, Derek Hale.
He knows that the attraction is dumb, lusting after an unnatainable subject? Story of his life.
Derek knows about Stiles' attraction... He's tried his best to keep his calm and not act on his own attraction, hut how long will that last?
Or: Stiles frequently fantasizes about Derek destroying him. Derek often fantasizes about making Stiles' fall apart.