Prince of tricks and King of the forgotten (blue exorcist) (on hold)

Chapter 5: Mephisto makes a good teacher

Third-person pov

Both stayed in the hug, nuzzling into each other's neck until they felt a small impatient pull.
"Looks like our big brother wants up back," Amionon said before poofing them right back to the office to an impatient-looking Mephisto.
"Do you know how long you were gone!" Mephisto said loudly, but how the sun was setting gave them their answer.
"It was only an hour" Amionon shouted with a slight glare. Mephisto scoffed a bit before grabbing Rin.
"My turn, then it's off to bed for you," he said while touching Rin's nose causing him to sneeze. Each of the demon kings seemed to melt as Rin blushed from the way the others were staring at him.
Mephisto snapped and they were in what looked to be a library. One filled with demon books and notebooks, almost all the information about demons and different animals. Rain looked around as the room seemed to move slightly, due to Mephisto's magic. they were moved over to a bench and a small otaman. Mephisto sat down and put his feet up on the otaman before patting next to him for Rin to sit down as well.
Rin sat down and Mephisto put an arm around him.
"I'm sure you have questions, but I haven't told you about my experiences yet," he said before going on for almost an hour about his time in Gehenna during mating season. Then he went on about his time in Assiah during mating season. Then he talked about things the family usually did together, at least one dinner, grooming circles, hug piles, and more. After a while, he stopped and looked at Rin who looked a bit tired. As he should be Mephisto had gone on talking for about two hours. Mephisto laughter before leaning towards Rin's ear. "Questions?" his voice was quiet as to not disturb Rin who seemed half asleep already.
"Y-yeah," he said yawning as soon as he tried to get a word out. "Whats grooming like? Egyn explained it a bit but I wanted to know more, and what are some of the changes?" he asked looking at Mephisto, his eyes giving a slight glow, not demonic but interest.
"Well I could show you what's grooming like, then you would know if you like it or not" he spoke softly still and Rin nodded. "Yeah, I want to know!" he spoke excitedly but calmly
Mephisto put a hand on Rin's cheek and gently tilted his head down. He nuzzled into Rin's hair a bit taking in his scent before grooming Rin gently. As he pushed Rin's hair back with his tongue a smile formed on Rin's face. He leaned into Mephisto's touch until he felt a slight pull on his tail. He whined lightly, it wasn't that it hurt he just wasn't expecting it. This made Mephisto smile lightly as his finger commend thoroughly through Rin's tail. Slowly the older demon's tongue made its way onto Rin's neck. The slow soft licks felt warm yet comforting. He nuzzled farther into Mephisto's shoulder. He gave soft noises and fusses as Mephisto continued. He felt Mephisto's tail slowly wrap around his waist while the tip went between his thighs making him give a slight whine. He shifted his weight and moved his body so there was no space between them. One of Mephisto's hands moved down Rin's back and under his shirt. He rubbed rin's back while giving small kicks to Rin's cheek. Soon he stopped, Rin expected some siliva to be on him but there wasn't much trace of any, just his hair being a bit pushed down.
He looked at Mephisto and the two smiled softly at each other.
"Your other question, what changes happen? Well, some demons get more powerful, others weaker, some get a feeling of being called into Gehenna, and some stay pretty much the same. Some changes are small but will stay, and some are brought on by something." he said before giving a small lick to Rin's ear before whispering into his ear.
"Your tail seems more sensitive than most demons" his voice made Rin shiver a bit before he let out a whine at his tail being played with.
"M-Mephisto" he mumbled out giving a small gasp for air as he started to play with it rougher. Rin's face became a light pink colour and it was quickly getting darker.
"That's adorable" he spoke again and Rin smiled a bit while head-butting Mephisto's inner shoulder softly.

The two sat with Rin falling asleep and Mephisto playing with Rin's tail and grooming him periodically.
After a while, Mephisto was going to bring Rin to his dorm but anytime he would move the younger Demon would huff and give slight whines, Rin's nails had grown sharper and could easily pierce the skin so as his nails dug into Mephisto's back as Rin clung to him Mephisto couldn't help but give a few whines of his own.
Rin woke up to one of Mephisto's bigger whines and notices his fingernails covered in blood.
"A-Ah- I'm sorry. I didn't mean to. I'm sorry" he cried trying to back away from the other only to fall onto his butt on the floor.
"Sorry Rin, I didn't expect that to hurt so much, come here, you don't have to apologize to me," Mephisto said sitting up and grabbing Rin gently.
"I'm sorry" he mumbled again but this time Mephisto ignored him and gently started to groom his hair and face a bit before moving over to his neck. At one point Rin gasped and stiffen a bit as Mephisto's tongue rolled around his ear. This made Mephisto freeze thinking he had hurt Rin or was being too rough.
"Did that hurt?" he question but Rin shook his head.
"No, it felt good" he confirmed and leaned his head slightly so Mephisto would continue. Much to his disappointment he didn't. "Please don't stop. I like it" he whined a bit but Mephisto shook his head.
"You need sleep, and I kept you here long enough" he was about to snap them to Rin's room but couldn't as he got distracted by Rin grabbing into his neck and nuzzling it. Rin's words made his mind go blank before he looked at him wide-eyed. "But you didn't teach me how to groom others"
"R-right" Mephisto mumbled before leaning closer to Rin's head.
"Well, you kinda just allow yourself to take in there sent and then you mess with there hair or tail. You can lick around a bit until you and they are comfortable and then instinct usually takes over, that's the best way I can explain it"
Rain nodded and leaned towards Mephisto's hair. The smell of dust, smoke, sugar, and the slight smell of Sulfuric gass. It was then he realized this sent was on every demon. Sulfuric gas was a smell on all the demons in some way or another. Rin's tongue grazed over his hair gently and he felt the small pull to do more. He guessed this was his instincts kicking in a bit, while it was his instincts weren't fully there yet. He continued to gently lick back Mephisto's hair until even the big puff in the middle was down, he then moved lower. His tongue guiding his. Mephisto slightly annoyed by how his little puffy/spike was down but he could smell the demonic instincts coming from Rin and despite being stronger then him he knew during mating season Rin would get easily get what he wanted and no one would care to question him. It was his instinct that gave away his demonic blood line. Finally he stopped and looked at Mehphisto. "That was okay right?" he questioned a bit making Mehpiato's eyes snap open. Mehpisto nodded. "Yeah that was great, I didn't expect you to be so good at that your first try, especially only seeing it once" he said while Rin's face continued to get a darker blush covering his cheeks, nose and ears. "Well you are a good teacher!" Rin said happily before Mephisto took the both of them to Rin's dorm. Rin fell asleep quickly. Yukio was fast asleep and Mephisto smiled at both of them before snapping away and appearing with the others in his office.