Comic I've been working on is more about brothers but BL is a part of the sub story because one of the brothers is gay, and both brothers meet potential love interests.
There's another gay couple later on in series
I'm a RL gay dude so I guess was aiming for both gay and straight characters adjusting to the situation of the story, than BL being the focus. Guess that would also make it the kinship between a straight and gay siblings.
The story follows two brothers Owen (12) and Evan (21) who are asymptomatic carriers of a virus that instantly mutate others into monsters. Their condition also grants them whacky powers based on states of matter (liquid, solid, gas). They try to survive the infected and rescue others without infecting them. They hope to reunite with their parents at a shelter, but that seems highly unlikely.
Further in, they encounter other carriers dubbed 'Sick Boys' caught in a battle royale and further complicating the outbreak.
So far, Owen can transform into Gas, Evan could calcify his saliva to make melee weapons (Solid).
On the BL side of things, Evan has feelings for Xun, a manager of a Gay night club, his powers are Liquid. He becomes the brothers' mentor and an ol flame also shows up.
Aiming for 4 seasons and the other gay couple show up in season 2, they were supposed to have a boy rescue boy kind of vibe. Some of the plot is tied to that gay nightclub Xun runs.
with regard to reincarnation
It's meant to appear like a biological sci-fi at 1st but its more dark fantasy, was heavily inspired by ancient cultures and their concepts of using vibration (sound) as both a weapon and spiritual enhancement. Reincarnation and ancient beings exists to some degree yet left open to interpretation to the viewer, but that's like 3rd act stuff.