Decision

I showed the box to Elina before gently opening it, revealing the six glittering vials of Bloodline Furnace Potions; three of these vials held red liquid inside them while the other three held the black liquid.

"What are these potions?" Elina asked, looking at them with high interest, not only her but also Professor looking at them curiously.

"Blood Furnace Potion of S and S+ Grade," Teacher said in a shocked voice as she looked at the potion 

"What!" Both Professor and Elina said in unison, and their shock is a hundred times greater than Teacher's, and their eyes started to shine like a blinding sun. The expressions Ive seen on their faces, Ive never seen before.

Looks like I had underestimated their desire for Bloodline Furnace Potion; the Bloodline hosts have. It is one of the things that give them a hundred percent chance to upgrade their Bloodline, and it upgrades it numerously in a short period of time.