Karou heard him talking about Kumo, and then calling him Hitomi instead of his name Karou, things like this sparked interest in Karou, "Omo-omo-omo"(that Korean Omo(which means oh my) shit) was all Karou could say, well he did say that he would be coming back after few days, so he would be ready to question them, both of them, maybe he had been thinking of Hitomi this whole time.
Questioning Hitomi would be the easiest so far he thought, as she was more open minded than Makoto, he would ask them their relationship status, this would be fun, he better go get Hitomi, he would wave to his sensei, and run into the village, a sensation of excitement travelled around his body, finally, something to do