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Changelings are split into Castes, which are divided into which Changelings are fertile or sterile. Thirax and Pharynx are fertile Changelings of the Male Caste: almost all sterile Changelings are physically female due to the conditions of how the Eggs are developed, Male changelings however are virile and when they come of age are taken deep into the Hive to be protected by the Queen and Proto-Queens: tye only other fertile Changelings in the entire Hive.
 
The Proto-Queens choose a Male Changeling to mate with and produce further eggs for the Hive, naturally Pharynx got action while Thiorax was still too young to part-take in the process, in these days Chrysalis wasn't Queen, she was merely a Proto-Queen the same age as Pharynx was. She loved Pharynx and chose him to be her Exclusive, and the feeling was mutual with Pharynx often referring in private to Chrysalis as "Beloved Mate" during moments of intimacy.