Apr 10, 2025
A series of fan fiction stories in which they are spy's and find out that castle's father has been giving him drugs & injections to make him a "super" man. Beckett becomes pregnant and has to take the drugs for the sake of the fetus and her own health
This sounds like the Close Encounters (link to the first story) series by chezchuckles (@writingwell)
She also has at least 2 AU versions of that universe on A03: Army Castle and Trauma Spy.