
...what?
call me when there's English...

There is an english version, it’s been out for a while now!
https://www.mangago.zone/read-manga/placebo_memories/

Why is Polynesian sex suddenly a trend with established BL couples? I'd never heard of it or seen it anywhere before but this is already like 3 different BL now that suddenly have this concept just out of nowhere.

It's what they're doing in the story right now. Basically you get very intimate with your partner without actual penetrative sex (until the last day). You start slow with just mild touching on the first day and then you gradually get more and more intimate for the next 5-8 days afterwards, depending on how long you choose to perform the Polynesian Sex.

one thing i will never understand is when a king or ruler is soooooooo freakin paranoid about his heir usurping his throne? i mean your heir is literally going to be the one to take over the throne when you retire or die anyway so why are you so paranoid about them "usurping" your throne?
i'd get it if the prince was just another prince or extended royal family member, but he's the freakin crown prince! he's gonna get the throne eventually anyway so why are you so scared of him "usurping" you now?!

all the cliche "you can't protect her, only i can!" BS is sooooooooo damn annoying. like bro, you're both princes, royalty - neither one of your bitch asses can 100% guarantee her safety! just being near royalty is bound to result in danger...
also Selena can protect herself you dumb Neanderthals'! she don't need no man to protect her anyway!
okay so... if i understood this correctly...
*spoiler*
Leo's biological father (Remus Auror) is the brother in law to the emperor and is the reason Phileo is a widower since he killed Phileo's (MC of story) deceased wife (heroine of story)? Making him the true villain of the story?
You're wrong about the wife. Phileo has never been married or in a relationship. The black haired woman that died was his cousin (Leo's biological mom).
yea i think i got that fact mixed up with another story I'm reading. I guess he still hasn't met the heroine yet?
of course in that case it means her biological dad might still be alive since he's supposed to kill the heroine, but if the heroine hasn't appeared in the story yet then that means he might still appear later to kill her (or try to?), i guess?