Klein didn't know where to really start, since it hinged on Reia believing the story that Akira's essence is some kind of god essence that quenches the urges within her. And being well aware of their relationship, there is no way she would be able to get close since the only way to extract essence is through touch.
Reia stared in silence emitting a very intimidating presence that pressured Klein to speak despite not being ready at all.
"A-as I have told you I am a succubus and we extract essence. Please do not get mad when I say this but during the academy, I had gotten to extract a little bit from Akira. I accidentally ran into him during the time of my awakening and I couldn't control the monster inside me. I needed to get essence and I ended up attacking him, but right as I got a taste of his corruption it instantly returned me back to normal."