I never understood the logic of BL's

I’m ngl, I thought this too when reading it. I think if it was a real world situation, I’d be so nervous and refuse to leave my child alone with a random person I met for just a few days. But this is a story so it’s all fictional so whatever

Probably some sort of occupational disease, paired with a bit sort of hero complex? I mean he just witnessed someone attempting suicide afterall.

Also how and why did he believe the mc when he said he is not from their world

ssshhhh we don't question bl logic here