The Lady Who Would be Queen
As his penis slid from it's still partially human vagina; the only remotely human part remaining, the soft pink lips changed shape and color, and withdrew into the segmented body as hard plates slid over the opening and her cerci formed, his cum dripping from
Bug Thugs
An almost identical yet biologically distinct pair of cerci burst from his former backside, making it hard for an observer to tell what end of him was what.
Live and Let Thri
He kept one hand on the pore while his other dipped down to her cerci, the small feeler-like protrusions on the now-inverted upper tip of her abdomen.