Note: established relationship.
A/N: Just a sudden idea that popped into my head. Since I'm evil I'll leave it hanging, muahaha.
Brush
"I don't understand why does it have to be me." Gray muttered, turning his head so that he could catch a glance of Natsu. His prone position didn't help much.
"Because Lucy told me first." Natsu's reply was distracted, airy. "But you can also try to do it to me, later."
"Humph. Later, then." Gray agreed, unconvinced.
"Now shut up and let me work." Natsu chastised him.
"Yeah, yeah." Gray said as he rolled his eyes. He felt a little pressure on his left calf as Natsu poked him. "Ouch. Stop that, you dumbass."
Natsu only made a noncommital noise.
The fire mage seemed to be focusing on the task at hand and Gray couldn't help but think back to the conversation that had led to their current predicament.
"Lucy told me something interesting." Natsu had said suddenly when Gray had been taking a drink. The ice mage placed his mug down on the table and arched an eyebrow. "She was telling me about how some sigils might increase your power. She has been reading about spells and words of power - and let me tell you, it's a boring matter, I don't know how she does it - and she has come across that subject."
'Oh?" Gray said cautiously. "And what are you thinking?"
"Well, we could try it." Natsu said with a grin.
"We?" Gray asked flabbergasted. "Are you insane?"
"No! But I think we could try it."
"Natsu. It's dangerous. I mean, don't you imagine what could go wrong?"
"Nah, I'll ask Lucy about basic things. C'mon Gray, we should try it." Natsu's tone became a whine.
"Ugh. If something goes wrong I'm so gonna kick your ass."
"I promise it won't!" Natsu replied cheekily, knowing he'd won.
It wasn't too bad, in the end. Gray was just lying on his stomach while Natsu wrote some words on his back. The ink wasn't cold - Gray had endured cold and that wasn't it - but it left a momentarily chilly feeling on his back as well as a tickly feeling.
Gray was pretty relaxed, feeling himself becoming a puddle on the mat. But then something that wasn't supposed to awaken started showing signs of interest.
Gray frowned. Why the fuck did he suddenly pop a boner? There was no reason for that.
He started squirming slightly and heard a giggle from Natsu. That made his suspicions grow.
"What the fuck?" Gray said out loud after a more vigorous stroke of the brush. It had shocked him.
"Hm?" Natsu's answer was distracted and, when Gray looked back, he had a huge grin.
"You fucker. What the hell are you doing?" Gray asked with a hint of threat on his voice.
"Something that's working." Was the infuriating reply.
"You asshole!" Gray yelled as he stood up on his knees and turned arouns, hands grasping at Natsu's vest. "But fine, your plan worked. Now it's my turn." He said before kissing Natsu, quickly taking charge of the kiss.
It was his turn to play...