C220 Abo the Academy's Boss X Cold and Elegant Senior(29)
"Lord Host, in this world's settings, it's not enough for Omega to be temporarily flagged just once at the beginning, but Alpha's pheromones or injection inhibitors are also needed for the next few days!"
The System's voice made Qiu Lan's heart sink.
He did know some of the ABO settings from reading novels, but he didn't even know the labels were divided into permanent and temporary ones