Vampire's Blood (Gakupo x Kaito)

The promise

Kaito looked around, he seemed scared. The chains were hurting his wrists, he was struggling to get out. As he was in the cell, he heard footsteps he immediately looked up with scared face.
"Ah, you finally woke up"
It was Gakupo, of course.
"Please! Leave me alone! Let me out of here! Please!"
"Oh why shall i? Plus your blood tasted so much better than others..."
"Y...You already sucked my blood?!"
"Of course i did... don't you feel pain on your neck?"
"S...so that's the reason...!"

Gakupo chuckled.
"You will stay at this castle forever.... if you'll stay here... I won't need to kill people..."
"No! N...no! That will never happen! I... I have a throne to get on! That can't happen! I... i can't be your blood tank!"
"Trust me.... it's better here.... there are no rules at all... you don't need to be perfect unlike when you are at castle... stay here.... Kaito"
Kaito looked down and thinked deeply.
"N...no! Even if i want to, I... I can't! My father will kill me!"
"Oh then you just can come here at night... if no... you will stay here.... forever..."
"W...what...!? I... F...fine... but only at night... n... now let me go!"
"First of all, do you really promise that you will?"
"I....I promise..."

Few moments later, Kaito was released, he was about to go back to castle when Gakupo stopped him.
"Ah, Kaito wait..."
"W...what...?"
"Before you go.... i need a little bit of your blood...."
"W...what!? Y...you already had it! Why do you need it now!?"
"Just a little bit of energy till i take rest..."
"I.... f-fine...."
Gakupo then approached Kaito as he bited his neck.
"Ah... i...it hurts..." Kaito said as he felt Gakupos teeth and lips in his neck.

As the gakupo stopped sucking Kaitos blood he licked his lips that were covered in kaitos blood.
"There, now you can go."
Kaito was carresing the spot where Gakupo bited him.
"I...it hurted..."
"It won't be anything serious..."

Kaito opened the gate.
"Goodbye..."
"Bye...!"