Loving the Beast (Rin x Reader) (Lemon)

The Son of Satan

Warning:it gets cheesy and theres some sexual themes

We were in his kitchen, it was really late and we had no school tomorrow. I was sitting up on the counter with my legs dangling over. We made hot chocolate with mini marshmallows and he was starting to cook a late night meal. I was still in shock after what happened. He kissed me. It felt like the beginning of my life as if I were reborn. Kuro was cuddled up against my leg asleep as I sipped on my drink.
"Rin?"
He turned and looked at me. His eyes never changed emotion.
"Why did you kiss me?"
He set down the rag he had in his hand and came up to me.
"I've liked you for a while, and I don't know how, maybe instincts but I felt you liked me too so I just went for it."
I sipped off my drink.
"I'm glad you did."
"Oh you got some hot chocolate on you lip."
Before I said anything he licked my lips. My face grew hot with blush.
He wrapped his arms around my waist and nuzzled his head into my chest. Which made me go even more red.
"I'm glad I could finally do this with you."
I felt him smile. I set my cup down and hugged him back. Having friends and Rin wasn't such a bad thing.
"Do-does this mean that I-I'm your uh girlfriend?"
"If you want it as much as I do."
"Of course Rin."
"Then that means no one else can have you but me. You're all mine."
His tail swayed back and forth. The words rang in my head. I'm dating satan's son. Me. An exwire becoming an exorcist to defeat demons, is in fact dating one.
"Rin the food is burning."
He bolted his eyes open and ran to the stove, losing the warmth he was giving me. I got down and rubbed Kuro's cheek. I waltz over to Rin and hugged him from behind. His tail fidgeted and wrapped around me causing me to jump slightly.
"Okay. Foods all done."
He pours food onto two plates and hands me one. Then pours some in a bowl and hands it to Kuro. He ushers over and sits next to me. We feed eachother from our own plates from time to time and once we finish we go to his and Yukio's room. We sat on his bed and talked for what seemed to be hours and we brought up dancing.
"Well from keeping my guard up half my life I've never done much dancing."
"Really?"
I nodded at him and then he takes a deep breath and gets up pulling on my arm. He puts my arms around his neck and he puts his on my waist. We start to sway back and forth. He then takes his hand with mine and intertwines our fingers. We move together as one to the sounds of nothing. We were so close together our heartbeats started matching wavelengths. He started to hum a tune and spin us around clumsily. He picks me up and spins me around. We fall onto his bed and laugh.
  He had me in his arms and squeezed me tight. My face and hands rested on his chest and our legs tangled together. I sit up and push my hair away as I lean in to kiss him. He grabs my face and pulls me in closer for a longer, more passionate kiss.
  It got intense really fast. I pull my legs up and put one on each side of his waist, straddling him. He pulls me in roughly wrapping his arms around me. I brush my fingers into his soft blue hair and pull our lips closer. His tongue slipped into my mouth and our wet muscles danced and twisted together. I could feel his member growing between my legs. His tail flicked and twisted around my thigh. I pulled my lips away and a trail of saliva connected our mouths together. Our breaths were heavy and hot and mixed as one. I sat up and stared down at my boyfriend. His cocky fanged smirk and his tangled mess of blue hair made me warm inside my chest.
"What if Yukio walks in?"
"He's got work real late tonight. Probably won't even come home."
He tugged at my shirt urging me to come back to kiss him.
"The slight chance he does we'll get detention."
"You and me alone in a classroom for an hour or more? Hmm sounds like a lot of fun to me~" he cooed. He pulled me into a hug, his face resting on my chest. His hands started to roam until they located my butt. He then lifted me up  forcing me to cling onto him and wrap my legs around his waist, feeling his hard member against me. He brushed me up against the wall kissing up and down my neck, causing me to moan softly. Once he found my sweet spot he kissed rougher and bit down. His fingertips glide against my body up to my chest, rubbing and fondling my breast in circular motions. My moaning rised causing me to breathe heavier. He started going harder until his fangs grew longer as well as his ears. His head sprouted two blue flames and he started groaning and growling.
  "R-rin you're hurting me."
Once he realized what happened to himself he stopped instantly letting me go and pulling back.
  "(F/n)..I'm sorry I don't know what got into me.."
I got up and went to calm him down. After his flames extinguished he sat on the edge of the bed with his head hung low cradled in his hands.
  "Dammit what the hell is wrong with me?"
I looked in the mirror at the huge hickey on my neck. It drew blood slightly and had a burning sensation when I touched it. He leaned against the wall on his bed and looked so lost.
"That's never happened without me drawing my sword. I can't touch you anymore... I can't hurt you."
I come up to hug him tightly, he flinched at first.
"Rin it's okay. We'll figure this out together. I'm your girlfriend now. You can't not touch me. Don't freak out over something so small okay? Maybe it was a one time thing."
He nodded and held me tight. We laid down in his bed and cuddled. He held me so tight like a little kid. He felt as though he was gonna cry. He felt that bad about something that was so little. He must really care about me. I hugged him tighter and we stayed like that all night until we fell asleep.