i only have one thats cute with decent plot not toxic is that ok? its one of my comfort series. ik u asked for yaoi but this is shounen ai. the title says yaoi but its rly just shounen ai.
https://www.mangago.me/read-manga/honjitsu_wa_seiten_nari/
i'll come back if i find a good yaoi that fits those requirements.
aight im back with a list
https://www.mangago.me/home/mangalist/840779/
hope some of them suit ur taste. tbh i havent read most of these cuz i pretty much never touched isekai bl or even knew of them.

....this might be too much to ask but....I want a yaoi manga with good plot, nice smex scenes, fluffy moments, nothing toxic and it should be a reincarnation, isekai story. Too much to ask right?
( ̄∇ ̄")