Threesome BLs

I was suddenly diagnosed as an Omega. I didn't think it was serious, probably because I was ready to die.
But, what is this;;; Why did my 'thing' suddenly got smaller?!?!
Is it a side effect of the temporary prescription meds? Will it get better if I don't take the medicine?
The hospital is already closed at this time, and the only person I can trust is the School Nurse that I'm close to...

Jinu is a weak coward left in a world full of zombies, ruled by survival of the fittest. Then, there are those other survivors who would use him, or perhaps even protect him. In the midst of survivors fighting for the sake of survival, fun, and desire, what will Jinu's fate be?