I've been trying to find this anywhere and everywhere but no matter what, be it reddit or any other site, no one seems to know this?
It's either me having gone crazy or I don't know what.
Either way, it was a fully colored, probably Korean BL where the two are teachers.
One is a Beta with dark/black hair and the other a Alpha with light/white hair, taller than the Beta.
There was a Omega student who got in heat and it caused the Alpha to react to it and to suppress it he injected himself with suppressants but used a lot and it still didn't work.
The Beta teacher worried about it offers to help, explaining he learned that mimicking the marking process will slowly make him feel better and that since he's a Beta he doesn't need to worry about actually pairing.
I just can't find it no matter what and I did try to look in all the tagged ones but even if the tag says Alpha x Beta it still add Alpha x Omegas and mostly Japanese Manga making the research too time consuming.