Blood.
"NII-SAN!!!" Sasuke screamed as loud as his lungs allowed him.
Itachi, thinking someone attacked Sasuke, raced into Sasuke's bedroom, ready to fight. Instead her foudn his Otout sitting in his bead his hand cupped under his chin, catching the blood that dripped from his nose. "Oh, your first bloody nose."
"I'm bleeding!" Sasuke shreiked adorably.
"Yes, but you're fine, you wont die." Itachi explained. "Tilt your head back." Itachi handed him a tissure.
Sasuke took the tissue from his older brother and pressed it to his nose.
"Thank you, Nii-san."
Itachi smiled. "You're welcome. You know you're lucky you didn't wake mother or father."
"Why, what would they have done if I woke them?" Sasuke asked, unsure of why Itachi was saying he was lucky.
"Probably would have been mad." Itachi explained.
"Oh, can I put my head down now, Nii-san?"
"Yes." The odler boy replied.
"Okay." Sasuke said, lowering his head.