HighSchool boys trapped in a fantasy world. doesn't really have much action from what i see so far though.
King's Maker and then the book after which is King's Maker Triple Crown: Mature Version.
Red Candy. Not really fantasy but not many people are secret agents soooo....
Criminal Interview- also not fantasy but hey! serial killers
Hell & High Water
Reincarnated into Demon King Evelogia's World. This one is a bit......ummm. Yeah Just read it and you'll understand.
The Waning Moon
ENNEAD. I don't know if you would realllllyyyy call this yaoi but i guess it is since it's under the yaoi tag.
Blood Bank
Sweet Man
Your wish is my command- sailor moon but make it gay pornhub
Max Mojave's Case- not really fantasy but hey! Mafias
Stakeout- Detectives and shit my dude
Darkness Hound- my first yaoi and tbh one of my favorites.
A Dead Crow's Stare- Zombies
Interview with a Murderer- Yuh know, now that i think about it i read a lot of books with serial killers
special suggestions. If you don't like killing stalking or gore you can leave now.
Bentham- look chile. if you read killing stalking and didn't like it then take a HARD left right now. Pretend you ain't even seen this suggestion
MADK- .....okay...i LIKE this one so i don't really know what to say to you...... all i'm gonna tell you is that in the first chapter a demon rips his throat open so this guy could throat fuck him....literally. Once you get pass all the gore and all that other stuff the plot is like ridiculously good.
That's the end of my suggestions (cause this is getting a bit long). If you want more hmu i guess. Also i'm a aware that they don't have all the elements you asked for but let's be honest. it's really hard to find a good book with the right amount of fantasy, action and yaoi sooo.......
Omg, so manyyy, thanks UwU
Currently reading king's maker and Reincarnated into Demon King Evelogia's World. I dropped ennead for a while, cuz it's pretty disturbing for me uhuhuhu T-T
THANK YOU SO MUCHHHH again for the recommendations
Fantasy + action + yaoi= perfection (/TДT)/ this kind of manga is rly cup of my tea, can someone recommends manga/manhwa/manhua like this?