I can vaguely remember the plot. In the story, Leo is a bus driver and I remember the author saying that they originally planned to write one-shot, but then they decided to continue with more chapters (and at some point, the author went on hiatus). There's mature content and Leo is quite dominant and has a dark personality.
I remember that the plot took a fantasy turn at some point, and that the MC was a girl who'd occasionally hook up with her best friends - Ravi and another girl.
The story starts with a school trip, I think.