Looked it up, and apparently, it's exclusive to a site called MangaPlaza. But you have to pay for the available chapters (except the first chapter, where it's free) and you also have to wait for the updates.
It wouldn't be on here.
tysm!^^
Was also just looking for this after seeing a video!
If anyone finds a site for free PLEASE put the link
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lmk if u end up finding it im tryna read this too
just saw it on twitter and its called "When a BL fan falls in love" by Akaishirafu. I cant find it here? Also tried to search for the japanese name and still couldnt find it :/