I’m reading bias wrecker rn
Cherry doll scandal maybe?
There is a manga with this premise but I can't remember what it is called. I think it was two idols and their fans wrote fanfic about them so their company jumped on the queerbait opportunity because it was popular and had them pretend to date but then they fell in love and started actually dating. If I can find it I'll share unless someone beats me to it
You might also like My Influencer Boyfriend I think there is some fan shipping in that.
I ship my rival and me. That is the one you were thinking
Any yaoi manhwas where its celebrity x celebrity and their fans ship them together plss