Izuru notices the way Servant looks and acts around him. Motivated by the prospect of something "new" in his mostly predictable life, he asks to be shown what lust is since he had never experienced it himself. Servant, hesitant at first, gives in to Izuru's request and demonstrates what this term truly is.

Byakuya Togami definitely doesn't have a crush on Makoto Naegi. And, he definitely doesn't act on it. Definitely. (Basically, Naegami fluff, set during their time, in high school.)

When the Future Foundation helps the students begin to recover their lost memories, Byakuya Togami is horrified to discover that his feelings for Makoto Naegi are not what he thought they were.

Do you know how to get away with murder? Make everyone think you are absolutely insane and unworthy speaking to. It's surprisingly easy until someone tries to understand your actions. Be careful of the one who does that, he may lead you to your demise.