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   Melodic Mutation by Anonymous

   Fandoms: Project Hail Mary (2026), Andy Weir's Project Hail Mary - All Media Types, Project Hail Mary - Andy Weir  

   • Mature
   • No Archive Warnings Apply
   • M/M
   • Work in Progress

   06 Oct 2026

   Tags

   • No Archive Warnings Apply
   • Ryland Grace/Rocky
   • Ryland Grace & Rocky
   • Ryland Grace
   • Rocky (Project Hail Mary)
   • Adrian (Project Hail Mary)
   • Requited Unrequited Love
   • Not Actually Unrequited Love
   • Soulmates
   • Alternate Universe - Soulmates
   • Eridian Ryland Grace
   • Human Rocky (Project Hail Mary)
   • Human Rocky (Project Hail Mary) Looks Like James Ortiz
   • Species Swap
   • Human Ryland Grace
   • will add other characters soon - Freeform
   • Mutual Pining
   • past rocky/adrian
   • They/Them Pronouns for Adrian (Project Hail Mary)
   • no AI so sorry for all the wrong grammar and spelling i guess
   • Implied/Referenced Suicide
   • Fluff and Angst
   • inaccurate science
   • Awkwardness
   • Awkward Sexual Situations
   • Nudity
   • Non-Sexual Nudity
   • Misunderstandings
   • Miscommunication
   • Rating May Change

   Summary

   The Soulmorph is a complicated process honed by evolution where when Eridians meet their songmate, they both undergo a physical and physiological change that helps them better adapt to both environments, in order for them to produce healthy clutches with an environmental advantage to their birthplace.

   Pretty normal for any usual Eridian.

   The thing is, Grace is an unusual Eridian.

   -

   species swap au but also, they are soulmates HAHA

   Series

   • Part 1 of my stories

   Language:

   English

   Words:

   44,842

   Chapters:

   11/?

   Collections:

   1

   Comments:

   589

   Kudos:

   1,803

   Bookmarks:

   350

   Hits:

   26,953

   Bookmarked by MeddlingMoon

   02 Oct 2026