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Amusement flashed in Nikolai's hypnotic eyes as he watched the scenery become blurs from the speed. Maybe he should tone down his flirting. He does rather enjoy living, after all. ... No, he'll die doing what he loves. Or at least committing foreplay with him.
Unlike what Leon had predicted, the tail did move, but it went upwards. It slithered against the neck and slid up the chin until the triangle point was playfully fanning the lips. "I remember reading one of those comic books of yours. What were they called again? Manga? Point is, I recall a tentacle being shoved in a mouth. What were to happen if I used my tail, hmm? Shall we try it, darling~?"
Nikolai was sitting at the edge of his seat closest to Leon now so that his tail could go the needed distance. The grin on his face was just as devilish as his looks. He wasn't sure what the appeal of a tentacle attack (of sorts) was, but perhaps trying it himself would work. That, and he wanted to see the look on Leon's face~

With a bright laugh Nikolai pulled his tail away and resumed his old sitting position. "So you DO like it! Dear me, that's just so marvelous to know~" he snickered. "I'll never understand, but I'm eager to try it again. Hurry now, dearie. I'm not distracting you anymore, so you don't have an excuse now."

"Oh?" Nikolai purred as he leaned as close to Leon as his seat would allow. Despite the demonic features, the way his tail swayed side to side was more like a cat than anything. "What will you do to me, dearie? Will you spank me like the bad boy I am~?" he cooed and made a submissive, blushing face as he spoke. "Don't hurt me too hard, Leon." he moaned quietly.

The Sin smirked and climbed out of the car, following close behind Leon. As interesting as it would be to be spanked, he wanted to use his new powers and stamina on the man. Meaning to say, he was the only one doing the spanking today. Oh yes, he'd make sure to make that man cry out until his voice was gone, and even more then.

Leon was right, Nikolai was a patient person. It was when the bedroom doors closed that the Sin moved. He stood behind Leon, his hands at the man's side. "Although I took this form to protect you," he whispered into Leon's ear. His tail moved like a snake and climbed up one side of the man's pants, eagerly approaching the top. "I'm a bit worried I'll do more harm than anything." He kissed the other's ear and nibbled on it lightly as his tail brushed against its toy.

"Hush now, dearie." Nikolai hushed, emphasizing it with a tug from his tail. "If you're going to speak, it had better be my name or a moan. Feel free to do both at the same time~" One clawed hand slid up to Leon's chest from beneath his shirt, the thumb gently pressing against one of his favorite spots. His tail rubbed against the teacher a little longer before continuing its journey, stopping at the rear.
"Now then, do you remember where we left off in the car, dearie?" the Sin asked, his demonic grin audible while his tail teased the entrance.

The upper half of Nikolai's face darkened except for two glowing red orbs; he smiled again, though it resembled more of a shark's smile now. "My, what a naughty voice~ Let me hear more." he hissed then snaked his tail inside.

~~~

After a very long time, Nikolai gave himself the rest he deserved. He laid on the bed, sleeping. The fact that he hadn't been sleeping earlier was astounding and obviously a fight for the man by how easily he slumbered. Now that he rested and had little hiding his body, it was clear that even the hidden parts had been changed with his new form. The brand on his forearm was replaced with darker, thicker letters, and sprouting from those letters were sharp black markings that climbed all the way up to his shoulder like a tattoo. As time passed, however, so did these new features. The brand glowed indigo and slowly the markings crawled down his arm, back into the shrinking brand. His hair brightened and curled back to its original design, the marks along his eyes faded away, and his curled horns shrunk out of existence. In a matter of seconds he was back to his original self.