Yandere! Younger Brother & Reader (Older Sister)

The cat's loose

Roy trembled under Saiyo's demanding violet gaze. His back abruptly bumping into the base of a out of order street light in the sudden rush to retreat. The light flickered a bit, revealing a softening glare produced by the boy in front of him.
Saiyo chuckled in inhumane pleasure, running a few fingers through his pale locks.
"No need to be so shy. It's just a simple question of; where is she?" He cooed with indifference. Roy perked up, stiffening himself.
"I-I don't know..." His eyes trailed to the side in discomfort causing the rivaling male to grin.
"You don't have to straight out lie to my face. Geez, disgusting!" Saiyo spat earning a yelp from Roy. (They make me think of a dog fight -_-)
"I'm n-not lying!" Roy treatised. His hands shivered at the look of displeasure creeping onto Saiyo's face.
"Hehe, try that without stuttering for on", Saiyo whistled.
"?" Roy stepped defensively behind the pole.
"If you don't know where she is, lead me to someone who does. You're wasting my time!" Waving a hand in the air, Saiyo dared to close on the French man. (Boy)
"I-I don't know anyone either who knows!" Roy skittishly prepared his hands to cover his face. Sweat puddling at the bottom of his neck; and not because of the tremendous heat.
"Oho~, you wanna bet little boy~?" In a swift second Saiyo was behind Roy, a hunting knife hovering over an arterie running down the side of his neck. It tipped graciously closer to the plump patch of skin shielding the vein from the elements.
"Aahg!" Roy gulped, swallowing the traumatic thoughts that approached his mind.
"Now, will you tell me?" Saiyo breathed down his neck, intentionally sending threats to his conscious. Roy fluttered his eye lids, unsure if the reality before was, well y'know, reality.
He'd heard of these situations happening from his father, who was out perfoming espionages for his homelands government. His father would gloat all the time about how he ended up manhandling the person, however there is a large difference from then and now.
Unlike his father, Roy might not have the chance to return home. He wouldn't be able buy the groceries his mother hounded him to get, and he wouldn't have the chance to say goodbye to all the friends he made in his limited visit to the country.
"I ... told you, I don't know ..." Roy mustered to speak. Saiyo fed off his loss of words.
"Well that's too bad!" Happily obliged, Saiyo drifted the knife along shafts of Roy's tanned neck making him whimper in pain. Blood drizzled out of the cuts reflecting Saiyo's pleasure along its surface.
Roy attempted to slip out of his grasp, forcing his knife away with the palm of his hand; red splattered the side walk. His stumbled to the ground, drips flashing past his eyes before too splaying onto the pavement.
"There was no need to struggle. Now the street is dirty." Saiyo casually followed up. Roy staggered back, his hand scraping along with him; more red and inteseified burning stimulus.
"Augh!" He groaned, the liquid inviting nausea to settle in his mind. Saiyo snickered drawing the knife to his mouth for a mere second, lick; a small sweep of the blood clouding the knife.
"S-stay away from me!" Roy sputtered kicking his legs out at him while trying to regain balance. Saiyo gave a crazed look at him.
In a hurry to escape, Roy had backed himself up to a wall. Nowhere to run, hide, and defend himself. Eyes met other eyes and closed to accept the demise before him.
The brightness suddenly became less bright.
The sound of plastic bags dropping alarmed his ears. Cautiously, he peeked through the slits of his eyes had provided only to see a familiar pair in distraught.