Killed For 100 Years in Hueco Mundo, Aizen Invited Me To Soul Society! - Chapter 146: Auswählen

... willing, after he fell into Aizen's hands, he had no choice but to assist Aizen in the experiment.

Although Mazuru mentioned the quincy's hollowfication experiment in front of Aizen earlier but after capturing Soken, Aizen didn't plan to do that. After all, Soken is the last pure-blooded quincy in the world of living, and Aizen hastily hollowfied him, it will only pollute the pure quincy blood in his body.

So, while Soken was still in a daze, Aizen just took a few tubes of blood ...