Childe -your best friend of 7 years- is a vampire. You've known this about him ever since you were little kids -in all honesty, you didn't realise this wasn't normal until you matured a little bit and started going to school.
He wasn't a vampire like the ones you'd see in Hollywood movies; he wouldn't burn when out in the sun, holding a cross up to him wouldn't immediately hurt him, he adjusted his sleeping so he would sleep at night and stay awake during the day. However, he was slightly more sensitive to the sun, holding a cross up to him would scare him a little, and he still managed to function on very few hours of sleep. He was also allergic to garlic, but that could have been a simple coincidence.
But most importantly, he never tried to suck your blood. Whenever he was craving blood -which only happened occasionally anyway- he would find some animal blood. You knew he would never hurt you, and he made sure to make you fully aware of that.
No one else knew about his secret, and he trusted you completely and utterly about keeping it safe.
✧✧✧
It was late at night, and the two of you were lying under a tree, just talking and looking up at the stars. As you sat up, you accidentally scraped your arm on a branch that you didn't notice; the cut wasn't too deep, but it drew a little more than a small amount of blood.
Childe immediately noticed this and asked with a face full of concern, "Are you o-"
He got cut off by his own urges, the smell of your blood entering his system and setting off something within him. You noticed his pupils dilate; he shifted away from you, he didn't want to hurt you and he knew he couldn't hold back for long.
Without thinking, you moved closer, worrying about him. But he quickly yelled at you; he couldn't control the way he raised his voice, "No!! Stay away!!"