Felix understood that negative-inducing potion like those wasn't effective at all on him since they were considered as poisonous substances.
Heck, they were actually made from poisonous materials.
Hence, drinking it was the same as drinking free juice, and he wasn't going to let her know about it!
'Cheeky, trying to cheat my student?' Lady Sphinx smiled faintly, 'I allow it, just don't come crying to me when she finds out about it during your UISG games.'
Felix flinched at the sound of that but he still didn't plan on telling the Headmistress about it.
He understood that the moment he signed this contract, the Headmistress wouldn't be able to modify the contract when she realizes that she had been duped.
Though that would happen months from now to even a year, depending on Lady Sphinx's research results.
After all, he couldn't participate in the UISG without Lady Sphinx's enhancements.