Disclaimer: I do not wowp

Prompt- Justin poses nude for Alex's painting.

Extra warning: Light BDSM, teasing.

"I didn't mean to do it." Justin tried reasoning again. "Believe me Alex. The glass just slipped out of my hand."

"And it was just a coincidence that it fell on my art class assignment, right Justin?" Alex asked sweetly, smiling and batting her eyelashes.

"Yeah!" he nodded vigorously. "Please don't do this!"

"Do what?" she asked innocently.

He tugged at the ropes that were tying his hands to the wall. "This. Let me go, please…"

"Hey, you volunteered to help me redo my assignment." She pointed out, lazily flicking her brushes with her fingertips. "But I do need to paint something interesting. And you are…"

Swallowing his pride, he looked at her hopefully. "I am boring, right? Let me go please!"

…..And she pointed her wand at him, as if it was a sword.

His eyes grew wide in panic. "Alex! Don't!" he struggled harder against his restraints, shutting his eyes tightly in fear of what she was about to do. Perhaps she would set him on fire? Or pour ice-cubes over his head? Or maybe she was summoning a tornado, because he could feel a light breeze on his bare skin that sent shiv-

"OH MY GOSH I'M NAKED!" he screamed in panic, eyes even wider than it was minutes before. "ALEX!"

She grinned deviously. "Oh, relax, Justin, this'll take a minute."

"This is crazy! You're sick!" he yelled, squirming under her scrutinizing gaze. Her eyes were scanning every part of his body, specially that part. "ALEX! DON'T LOOK!"

She scoffed, dismissing him with a wave of her hand. "As if there's something to look at."

"Hey!" he protested. "It's seven inch."

"Really? Did you measure it, Justin?" she asked, chuckling. Then she paused, an evil glint appearing in her eyes that scared him. "Hey, that's a good idea!"

"Alex." he warned, this time in a low, threatening tone.

She never listened to him anyway, and while he is tied to the wall? No chance at all.

Flicking her wand and getting the spell wrong three times, she finally managed to get a measuring tape. With that in hand, she proceeded in his direction.

"Alex! No!" he tossed his head from side to side, hoping to find something that'll help him escape.

And she smacked his ass with her long, thin wand. "Stand still."

"Alex-"

SMACK! "I said stand still!"

He stood still after that, knowing it was useless protesting, and hissed in pain at the burning sensation in his rear when she smacked it one last time.

Meanwhile, she started concentrating at the task in hand. She slowly ran her fingertips up and down his length, enjoying the feeling of it throbbing in her hands, watching it grow under her touch. She lightly scraped the skin with her fingertips, and his breath hitched. She pumped him up and down, keeping her eyes fixed on his face, watching his reaction. He, for this part, kept his eyes closed, biting his lips to keep from groaning, but his cock growing in his sister's hands betrayed him- there was no hiding the pleasure he felt.

Slowly but surely, she sank to her knees. She started stroking faster, placing soft kisses on his head. His legs trembled, his hips bucked up towards her. She smirked in victory, flicking the tip with her tongue. She could already taste precum, and she smeared it with her tongue, liking the dirty taste. She then stroked his length up, and strew kisses on the way back. His breathing grew wilder and wilder, lust building inside of him. And then, she took him in her mouth- all of him, without any warning.

"Oh my gosh, Alex!" he gasped. "This is just", he gasped again. "Shit!" he mumbled, moaning in pleasure. "Mmm…. Keep going… please!"

Doing a victory dance in her head, she started concentrating on sucking him; occasionally giving licks that sent shivers down his spine. She bobbed her head up and down, letting her hair fall on his inner thighs and tickle him. If his hands weren't tied, he would have definitely clutched her hair and forced her deeper into him. This felt so good!

While she was doing this, she slowly started feeling herself get wet as well. The feel of her brother's cock in her mouth was turning her on! Unable to take it anymore, she moved her hand down to relieve her ache, touching her crotch through her pants and panties. She could feel her warm heat seeping out through her clothes, and she moaned around him in pleasure.

"Oh fuck!" he grunted, trying hard to control himself. Those vibrations felt so good around him!

Seeing his reaction and getting aroused even more by it, she moaned again.

"Alex!" he grunted, bucking his hips. "Oh my gosh!"

From the way his breathing kept growing more and more irregular, she knew he was close. Just when she felt that he was ready to cum, she released him.

"ALEX!" he screamed in frustration, almost on the verge of breaking down and crying.

She laughed evilly. "Now lets' measure this thing." Placing her slender fingers on his hard-on again, she placed the cold, long tape around it, and measured it. "It's an eight inch, genius." She announced, smacking his rear with her bare hands. "Hmmm I can probably paint this."

"What! No! You're doing this for school!" he reminded, tugging on the ropes again.

She grinned her sneaky grin, crossing her arms and titling her head. "I never said that, Justin."

(A/N: like it? I felt I had to do this because all the smuts I read had Alex tied up and never Justin. Reviews make me happy.)