Synecdoche/Methonium (mangaka of the fat elf manga) just released a doujin on Fanbox of Oku getting impregnated - according to him, it's non-canon and takes place in a parallel universe:
https://files.catbox.moe/baeplo.zip
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>>2988276
And a coloured Oku he already did
And a coloured Oku he already did