Kozue was touching him. While that was not altogether unpleasant, it broke his concentration, and the next line came out crooked. Most people would have received a lecture for the interruption, but Kozue was a special case. He didn't know better, and it was about time for them to bike home anyway. The inconvenience could be taken as karmic balance for leaving him to handle Akira alone earlier. 

He slowly packed up his supplies as Kozue continued on about the abandoned building next door. Yori hadn't given it much thought, despite the rumors, but the prospect intrigued him. The decrepit building could provide a wealth of sketch ideas, and it was a pleasant excuse to avoid going home. Besides, the two of them, alone, exploring a large, dark, abandoned building...

Any number of things could happen.

"Very well," he said, sliding his satchel over his shoulder. He strode past Kozue into the hall, and began walking not towards the front exit and their bikes, but the old school building.