@knightie Even it doesn't sound same as seme/uke or top/bottom, I used to refer MC=bottom and ML=top in similar sound. That's might be the case here.
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Omegaverse >ω< https://mangamirror.com/manga-list/106967
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Historical BL ♛➛ https://mangamirror.com/manga-list/122136
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Best stories ⛧⁀ https://mangamirror.com/manga-list/106911