Disclaimer: I don't own Durarara.
Shizuo spotted it out during one of their free lessons. The flea was sitting in his desk, knitting something. He blinked, nearing the other boy. He looked over Izaya's shoulder and saw as a scarf being knitted.
"What does Shizu-chan want?" Izaya asked, without even looking at him. Shizuo blushed, which made the other laugh.
"N-nothing, really!" Shizuo said, his cheek reddening. He turned on his heels and went back to his own desk. He had no idea why Izaya was knitting a scarf, but he persuaded himself that he did not even care.
"Mairu, come back here!" Izaya called out for his sister who locked herself into her room. The older boy ran his fingers through his hair. He must have known that the color was not the best choice.
"NO! I would rather die than put on a pink scarf!" She whined angrily, closing herself into her closet. "I will never forgive you because of that!"
Izaya sighed. He opened the door, then pulled his sister out of her hiding place. Mairu was kicking and tried to hit him, but she did not succeed. Izaya growled, then twine the cloth around her neck.
"Stop… whining," Kururi said which made Mairu tearing up. She was grumpy all their way towards their elementary school.
Izaya rolled his eyes as he was walking out from his sisters' school. Sometimes he wished that he would have two brothers than two sisters. Beside their school, there was a middle school as well. His eyebrows raised up when he saw Shizu-chan walking out of its gate.
"Oya, I never would have thought that Shizu-chan has special lessons before school," Izaya snickered, making Shizuo snarl. A smile appeared on Izayas' face, but before he had said something, he sneezed loudly. Shizuo blinked once. Izaya raised his hand up and had to realize that he left his own scarf in their house.
"It looks like you already have amnesia. Leaving your scarf at home in December…" Because of the little grin on Shizuo's face, Izaya wanted to slice his throat up, but another sneeze prevented him in it. "You are hopeless," Shizuo mumbled, stepping next to Izaya.
He took off his own scarf, then twined half of it around the raven haired boys' neck. Because of the sharing, they had to walk extremely close to each other – so close that Izaya felt the heat coming from the other teen's body. Suddenly, he felt as a shiver ran through him. That's why he hated December! Everything was cold and dark and-
"You should take better care of yourself," Shizuo muttered, hugging Izaya to himself by his shoulder.
In that moment, despite the chilly air, Izaya's body warmed up so much that he did not understand why he had felt cold only a few minutes before.