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Summary
After eight months of proper dates, pack drama, and a surprisingly sweet family reveal to the Sheriff, Derek finds himself quietly consumed by a new fixation: Stiles' oversized dick. What starts as curiosity during their first fully naked moments quickly turns into full-blown obsession—he can't stop staring, touching, tasting, or fantasizing about it, even while everything else in their sex life follows a predictable pattern.
Or the one where both of them silently assume the other wouldn't be interested in switching(Alpha stereotypes + size anxiety), only for a birthday surprise to blow all those assumptions apart in the most satisfying way.