parentlock en · NOUN
Etymology
Blend of parent + Sherlock.
Meanings
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(qualifier:Sherlock fandom slang, uncountable) A subgenre of Sherlock fan fiction in which Sherlock and John raise a child or children together.
The relevant tags here were very similar to LJ, if phrased slightly differently: e.g., parentlock (portmanteau of parent + Sherlock), military John, genderswap, mpreg.
2017, Judith May Fathallah, Fanfiction and the Author: How Fanfic Changes Popular Cultural Texts, page 65:All of these AU parentlock stories or series become "alternate" because of a change in the Sherlock-John relationship and the inclusion of a child who becomes theirs.
2018, Jennifer Wojton, Lynnette Porter, Sherlock and Digital Fandom: The Meeting of Creativity, Community and Advocacy, page 41:Especially because of Season Three's depiction of heavily pregnant Mary in "His Last Vow," fans who ship Johnlock are more likely to consider the inclusion of a Watson baby within the parentlock narrative of Sherlock and John.
2016, Alyxis Smith, “Fan Fiction as an Argument: Arguing for Johnlock through the Roles of Women and Explicit Sex Scenes in Sherlock Fan Fiction”, in Lynnette Porter, editor, Who Is Sherlock?: Essays on Identity in Modern Holmes Adaptations, page 164: