Im sorry but I don't know the story you’re looking for however, its insane how many stories fit that premise of “uke raised in the jungle by seme” for example:
Saru to Momo
Amanojaku ni Koishite!
Kamisama to Tobenai Tsukai
The author Nagabe of, The White King has multiple stories with this trope
Tabenai no? Ookami san
Kiaedam
Yoichi to Tsugu......
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