The Rise of Isekai BL

* Transported into another world (?)

"This manga starts out with Akabane being sucked into a different world with another boy (Moriya) and run into a girl named Marion, who is a fighter. Apparently only through the exchange of body fluids between the two boys can power her up to fight."

* Time travel back to his past self

"Qiao Yu, the man I humbly guarded for more than 10 years,unexpectedly cheated infront of me!
This is not the worst part. While I was fleeing from the difficult situation, I had an accident with the elevator. I fell into darkness together with the elevator. When I woke up again, I'm back to where I first meet him!"

* Reincarnation of both characters

"Retired soldier Araki Kyosuke returns to Japan to settle down for a quiet life but when he meets heir to a big corporation Mimasaka Lune, old memories of a former life flash into his mind. Reluctantly, he becomes Lune's bodyguard to protect his protégé from attacks while learning of their past lives. "

* Transmigration

"Multiple transmigration locations versus multiple drop-dead handsome appearances. Qi Yan transmigrated after he died and is permanently locked by the system to return to the world as a different male character each time to target a different male host. Despite experiencing multiple sources of seductions, he can effortlessly retain his loyalty to his one true love—but is that truly possible?"

*Time travel back to the past (different era)

"One night, after being accosted by a fortune-teller who's adamant that Tanaka will meet with great misfortune, he is shockingly confessed to by a work colleague. The two men struggle and following an abrupt fall, Tanaka mysteriously finds himself tossed back in time to the year 1581. Suddenly thrust into the violent world of the Warring States Era, our reluctant time-traveler is in for the adventure of a lifetime."

* Transmigration

"Basically a modern day alchemist trabsmigrates into another world and is forced to marry"

* Reincarnation into the body of somebody in a modern world

"This comic tells about the mighty general who was forced to live with the beautiful iceberg man through the modern age! General scared?! Never!! Buy food and wash dishes, doing live broadcasts to make money, fighting villains! But why do you always transform into a large puppy in front of your beautiful "guardian"? No way, the beauty is too provocative, who can withstand this ... but this general is not that innocent too... "

* Transported into a video game (?)
NOTE: more shounen than yaoi

"I, Anan Naoyoshi, joined Last Boss Korin, Co. in pursuit of Nobu-san, the game planner I’ve long admired. Things, however, are sour between us.

Our strained relationship aside, the two of us went on an overseas business trip. But then whyyyyy are we on a desert island?! And as if that wasn’t bad enough, he now tells me we’re stuck in a game of his own creation. Wait.... "

* Transported back in time to an alternate timeline

"Ha Jae has been in a one-sided love with Cha Hyuk for years. After being invited to Cha Hyuk's wedding, Ha Jae is transported to an alternate timeline where Cha Hyuk and his girlfriend have never met and begins a journey to end his unrequited love."

* Transported into a fantasy world

"School rivals, Charles and Kai, unexpectedly get transported to a fantasy world and discover details about themselves."