Kyojuro Rengoku was your Sensei already for a few years. He never knew how to express romantic feelings to you, so just stalked you and always was taking pictures of you and stealing some of your stuffs, then just looking at them for a few hours. He was able to kill anyone if he or she gets your attention, even if it will be human. So he easily gets jealous...

Right now he's in backyard of Butterfly mansion, training, not having time to make more photos of you right now