Looking for an older Trunks x Male OC ( older half-brother) fanfic

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Hi everyone,

I’m trying to track down an older Dragon Ball Z fanfiction that I read quite a while ago. The story focuses on (Future ) Trunks, who discovers a prisoner that is revealed to be his older half-brother. In this fic, Vegeta is the father, though i think he never actually knew this son existed—I can't quite remember if the character was born naturally or created as part of an experiment. I believe the OC’s name was Zion. Part of the plot involves the developing relationship between Trunks and Zion. As in m/m. Does anyone recognize this plot or remember the title and author? Any help would be greatly appreciated!"