frrr, I thought there were more, but I could only find 3! Now I realise why I didn't make a list for it back then. But I started one now anyway, because I decided to have hope for the future!
ahhh could you link me your list / the manga you know? i only know one and a half works where the trope might fit TT
Idk if you have read this but here is one that i can remember from the top off my head rn
https://www.mangago.zone/read-manga/nande_koigataki_ga_ki_ni_nannen/
this manga is actually the only example i can think of lmao but ty still!
this manga was made for me i've been begging for a yaoi manga where the two love rivals are falling for each other for ages!!!! DECADES!!!!!!!!!
i swear this trope should way more popular esp in yaoi