Diavolo was walking around his castle getting some papers done that he forgot to do yesterday until he heard a faint knock on the door as he passed by it.

Curious he set the work down and went to open the door and as he did Mammon nearly just fell forward until Diavolo caught him.

Mammon then flinch in pain shaking a bit from pain as his whole body hurt and the slightest touch felt like a thousand needles

Diavolo: wh-What happened to you!?"

Diavolo quickly notice how Mammon looked badly hurt and had cuts and bruises all over him and was bleeding from different wounds on him his bottom lip was cut a bit open and bleeding one of his eyes were swollen shut. He was bleeding from the ears seemed to have a broken arm and leg. Diavolo Wondered how he even made it here.

Mammon: I... it's.... it's ok.... please don't tell Lucifer..... please...."

Mammon then suddenly passed out and  Diavolo quickly picked him up and carried him to get help from Barbatos

About an hour or two later Mammon suddenly woke up and he wanted to sit up but couldn't he was in too much pain.
He then looked around and saw Diavolo sitting on a chair next to his bedside talking with Barbatos until they saw him

Barbatos: how are you feeling?"

Mammon : .....bad..... really bad....."

Barbatos : you are very badly injured. It's surprising you made it here. I did what I could even for the old wounds too. Your body is very weak and fragile from the constance damage it was receiving it would be a miracle if you healed at all. "

Mammon : ......so.... positive....."

Diavolo : Mammon....you think I don't notice the wounds you have....but I did but when I tried asking about it you brush it off or make up an excuse....I want to know what's been going on...."

Mammon : I....I owe a lot...of money....to a lot of bad people....mostly these Mafia guys.....I don't pay them on time....they beat me for it... money or not they just.... keep beating...at this point....I don't think the money even...matters to them......pretty sure they just like tormenting me......"

Diavolo : that's why you have so many jobs...to pay them off....I know who your talking about.... did they do this?"

Mammon : ....yes....was pretty sure I was a goner.....I don't even remember getting up...."

Barbatos : we have to let your brother's know what has happened your safety and we'll being is far more important than keeping a secret"

Mammon :....make something up! ow!....they can't know yet....I don't want them to know....not like this...."

Barbatos : getting involved was the last thing I wanted. I will come up with something but I am telling them about your money troubles. "

Barbatos then walked over leaving and as he did diavolo said.

Diavolo : Mammon if you told me I could of helped you.....you know I would of helped you ...."

Mammon : no.....I don't want to do that again....not with you.... because your different...."

Diavolo : I....I don't know what I would of done if....I won't let this happen again I'll talk with them "

Mammon : no!....what if they te-

Diavolo then kissed his forehead and said standing up.

Diavolo : don't worry about it. Just know I'll fix this"

Mammon : .... this must be what.... everyone feels before I do something stupid....."

Diavolo  : .....like I said don't worry about it..."

Mammon : .....you probably could handle it anyway...."

Diavolo : I have to talk to them anyway for other reasons I just won't be as polite "

After this Diavolo left the room and started walking away leaving to go see these demons.

And as he was leaving Barbatos saw him and sighed and then said going to get something.

Barbatos : now I have to deal with this.... hopefully he leaves no evidence behind again this time......"

Later Diavolo arrived at where he knew these Mafia boss and his guys hideout were. and as he walked in he knew what he was doing was not the best choice of action or the most thought out or responsible one but all his thinking went out the window the second he saw Mammon in the condition he was in.

He was going to make sure they never hurt him again and pay for what they were putting him through. and hopefully that would make everyone else step away to in the process. He was using these demons as an example.