About one to two weeks later Mephisto and Lucifer didn't really talk just went on with their lives but Lucifer kept a close eye on Mephisto knowing something could happen again that he would be hungry again.

Anyway tonight Lucifer was in his office sitting at his desk and finishing up work and looking into what he thought was going on with Mephisto until suddenly there was a knock at his door.

He then said come in and in walked Mephisto who had the same animal look in his eyes and looked a bit annoyed.

Lucifer : it's a problem again?"

Mephisto : ..... would I be here if it wasn't!"

Lucifer : would be nice to know from your side of things why yo-

Mephisto : we....we can talk later...."

Lucifer : do as you wish then"

Mephisto : ......"

Lucifer then put down his work and scooted his chair away from his desk but before he could get up. Mephisto with no hesitation got on Lucifer and bit down hard on the side of his neck and started sucking his blood.

Lucifer gasp at this sudden action and started breathing heavily as Mephisto was sitting on him sucking his blood.

He never experienced something like this before and it kinda hurt way more than he thought it would.

But he just sat there one hand on Mephisto's back and the other on the back of his neck to make up sure Mephisto wouldn't fall off of him.

All Lucifer felt was this sharp stinging pain throughout his neck and body he felt almost paralyzed but didn't mind it.

Lucifer : y...you have the problem of one of the first few breeds of demons...
specifically the Muzan breed that went instinct long before most of us were born especially you....so how is it possible?....you sh-!?

Mephisto bit down harder which cause Lucifer to jolt a bit but Lucifer then said kissing Mephisto's neck a bit which Mephisto didn't expect to happen when he bit down harder to avoid the question.

Lucifer : Oh don't tease me. I just ask a simple question? But since you did so I'll do so back"

Mephisto then started breathing heavily especially as Lucifer started undressing him taking his jacket off and unbuttoning his shirt.

Mephisto didn't expect this to happen but he didn't care all he could think about was Lucifer all he wanted was Lucifer and his blood.

The next day in the morning Mephisto woke up in Lucifer's bed and as he sat up Lucifer also woke doing the same.

Mephisto covered his mouth it hurts so much probably because of how hard he was sucking the blood out of Lucifer.

He then looked at Lucifer who had claw marks on his chest back and neck and surpriseingly the bite mark on his neck wasn't that bad at all and looked vaguely visible.

He was mad at himself that he slept with Lucifer once again And embarrassed Lucifer then ask looking at Mephisto.

Lucifer : how long are you going to just stare at me?"

Mephisto : I'm not!"

Lucifer : so was that enough? Surprised you didn't suck me dry"

Mephisto : oh believe me I was trying to but you weren't dying and I was getting full"

Lucifer : anyway my question never got answered"

Mephisto : I... it's unrelated"

Lucifer : couldn't be but I'll drop it for now"

Mephisto : .....this means nothing...."

Lucifer : exactly what I was thinking"

After this they both got dress and then quickly left Mephisto sneaking out before anyone saw him.

later Lucifer decided to go talk to Barbatos about the Muzan breed of demons to see if he knew anything about them

And as he walked into the castle and went to Barbatos room to meet with him in Barbatos then ask.

Barbatos : Lucifer what did you want to ask me?"

Lucifer : what do you know about the Muzan demon's?"

Barbatos : ...... Lucifer why would you want to know about that?"

Lucifer : in the tour in the museum it was briefly mentioned correct? Remember I have the tour to do for Diavolo and he was suppose to tell me everything like usual but he slack off again."

Barbatos: right anyway.....Long ago in the beginning of demons a few hundred to thousand of years after the humans were around a certain species of demons were born.

But the Muzan demon's we're created by a human who was turn into a demon. He went on to create more people like him by giving humans his blood he was powerful and so were the others but him along with the others were killed by orders of the king himself. No one was left alive. "

Lucifer : I see..."

Barbatos : they would eat humans drinking their blood was their prefer choice or they would starve depending on the blood depended how long they could go without eating again also sometimes made them more powerful. It was a very messy situation. "

Lucifer : thank you for information I have to go now"

After this Lucifer left and started to wonder more about Mephisto's situation.