Yukio x reader x Astaroth

Gehenna

The picture above is Astaroth he only looks that way for school any other time he looks like himself unless he's around the twins he is also y/n familiar so when you summon him I will give picture in the authors note... Well here's the next chapter
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"My child" a voice came from ahead of me as astaroth held me in his arms. I looked up to see satan standing Infront of me.
"Hi dad" I said I know what everyone would think of me calling satan my dad but he's the only one who was really there for me as a father figure besides shiro. Astaroth set me down and I was fully healed being in Gehenna. I ran to him and hugged him with tears coming down my face.
"Shh..my sweet girl what seems to be troubling you?"he questioned
"He..he- I choked out a sob
"He rejected me!"I cried
"It hurts...it hurts so much" I said
He breathed out with a concerning look on his face
"You found your mate child?" He asked
"Yes" I said quietly
"Nobody rejects my child!" He yelled
"Who is it?!" He said
"Yukio Okumura" I said with silent tears streaming down my face.
"It okay child but you can stay here as long as you need but he will regret it I promise you that even if he is my son." He replied
"Thank you" I said as I let go of him I wiped my tears off my face and said
"Train me"
"W-what?" He was startled by my quest.
"Train me how you were" replied
"Are you sure about this? There is no going back one you start" he said with a serious face
"Okay" I replied

~One year later~
I was a totally new person now or well demon...I had increased my power almost to its full capacity. Right now I was roaming the halls with astaroth
"You know not that I don't like you here because trust me I love that your back but do you think it's time for you to go back you know your school and friends..." He said
*sigh* "yeah I know I'm going to have a lot of work from cram school unless I can pass the test and I have been thinking about it...do you think anyone will recognize me?" I questioned him
"Haha definitely not!" He said picking me up and twirling me in a circle
"If I could've I would have picked you as my mate" I said looking in his eyes
"Don't say that you haven't been near Yukio in a while and once you do you'll try and go back with him and you'll forget" he sighed
" I would never do that especially after what I've been through and I wouldn't ever forget you" I said and put my lips on his. He stood there frozen for a moment before realizing I was actually kissing him until he kissed back. A whole year of emotions was put into that kiss and he pulled back
"Ha right when your gonna leave this had to happen" he whispered breathless
"Yeah...promise me...promise me you'll visit" I said
"Well..." He said acting like he won't. I slapped his chest
"I have a better idea" he said
~hours later~
"Bye dad" I said
"Who knew a year would pass by so quickly my child" he said
"I know, I'll visit" I said
He nodded
I made a self portal and stepped in.
I was in front of my dorm again it didn't look any different then last year. The only thing I was not looking forward to was seeing yukio. I pulled out one of my familiar papers and smiled, I cut into my wrist and put my blood on my paper and he appeared in his wolf form, he nuzzled against my stomach. He was about six times the height and weight of a normal wolf.
"Come on Astaroth" I whispered and he walked in beside me as I opened the door to the dorm. I let out a breath once I realized they must be at cram school but they should be back soon.
Astaroth changed back to himself.
He scoffed
"What a dump"
I smacked his arm
"This is my home too" I said
He grunted as we walked upstairs. It seems like somebody's been in here since I left.
I sat in my bed
"Well this is my room" I muttered
He walked in front of me
"What?" I questioned
He got on me and pushed me back into the bed
"Astaroth?" I said
"So what does this mean?" He whispered looking at me with lust.
"I don't know" I said
"I don't care, your the only one I've ever wanted" he whispered against my lips
"Astar-" I was cut off from him smashing his lips onto mine, I immediately kissed back. His tail went under my pants and started to message my clit.
I moaned
He had his hands on my stomach making circle patterns with his thumbs.
"Look what you do to me" he whispered and kissed me again, he ran his tongue along mine but as soon as it could get any further we hear the boys close the door
"Damn" he muttered and jumped off me while turning into one of his forms...his wolf form.
He looked at me and I patted the spot next to me, he crawled over and curled up next to me while I closed me eyes listening in on the boys conversation.
"Someone is here" yukio said
"It's y/n!i know her scent she's back!"rin said excitedly
"Rin you know she's not coming back" yukio said
"No!!its her! I know it!" Rin said and it sounded like he was running up the stairs
"You idiot! It could be a trap! It's not her!" Yukio yelled after Rin as he started running up the stairs also
Rin busted through my door and I kept my eyes closed
He let out a breath
"It's really you."rin said as yukio came through my door
"Rin you-" he started to say but I guess he saw me
"Y/n" he breathed out
Astaroth started growling
"What the hell?!Get away from her demon!" Yukio said and I'm assuming grabbed his gun because I heard the click
I immediately burst into flames and opened my eyes
"Don't touch him" I said in a dark voice
He lowered his gun
"Y/n?" He questioned
I calmed down and my flames went away
"Hey Rin...Yukio" I said
"When did you get back?" Yukio asked
"Not to long ago" I replied
Rin jumped on me and hugged me
"Y/n!you were gone for so long!!" He whined
Astaroth growled again
"Missed you to Rin" I said hugging him back after a minute he got off me and stood in front of me,I crossed my legs and sat up, Astaroth crawled into my lap and I started running my fingers through his fur.
"So, how have you been?"Yukio asked
"Fine" I replied
"Are you going to start school again?" Rin asked
"Yeah, I also have a um old friend joining" I said
"Really who?" Rin asked
"Um you don't know him" I said
"Oh well hopefully we can all be friends!" Rin exclaimed
"Yeah" I said
"I have to go grade papers so I'll hopefully see you tomorrow" Yukio said walking out
"Yeah you usually tend to do that" I muttered under my breath
"What?"Rin asked
"Oh uh nothing" I said
"Okay we'll see you tomorrow y/n!" Rin said leaving the room
I sighed
Astaroth immediately shifted back to himself and locked the door so if they came back they wouldn't see him.
He came back over to me and laid down
"Are you sure you want to go to school? Even if I'll still be there for you"he said
"Yeah I'm sure" I said looking at him in the eyes
"Hopefully nobody can recognize you tomorrow besides Mephisto and me" I said
"Mmm" he grunted and moved a piece of my hair out of my face, he gave me a quick kiss
"You should get some sleep then" he whispered
"Yeah" I replied and closed my eyes while laying my head on his chest.
I felt his tail tap my thigh, I smiled and wrapped my tail around his. I finally felt safe, and wanted again.