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Author's Notes: Trigger warning. Nagatoro and Senpai's relationship is progressing and this story is now rated 'M'. Please don't read if you're sensitive to mature themes! — SK
Music
As Senpai secured the chain around the fence, Nagatoro shed her robe and dove into the pool. After a quick swim, she reversed course, and took a seat between the silver posts of the ladder. She rested her arms atop the ladder's sloping rails and set her feet on its top rung, submerged half a foot below the surface of the water.
Senpai paced behind her.
"What's up?" she asked.
"I'm trying to figure out the best angle. Normally, I paint you head-on but I'd have to stand on the other side of the pool to do that and that's too far away." He stopped, pinched his chin, and smiled.
"My pervert sensor is pegging. What nasty thoughts are you thinking, Senpai?"
"Nothing unprofessional. Looking at you from behind reminded me of a picture in one of my art books. The curves of your body sitting like that look exactly like a cello. In the book, the model holds her arm to her face with her hand flat so it looks like the cello's neck."
Nagatoro put her arm to her face and flattened her palm. "You mean like this?"
"Right. Something just like that."
"Take a picture. I want to see."
"Isn't that breaking one of our rules?"
Nagatoro extended her index finger. "Rule number one. The naked girl makes all the rules and she can break them whenever she wants to."
"Um... okay." Senpai kneeled behind his model, took several pictures, and handed her his phone.
She flipped through the images. "These look really cool. Do you want to paint me like this?"
"I'd rather not. The painting won't blend with the others if I don't capture the charm of your smile."
"And the charm of my shoulders, and my breasts, and my bum, and my thighs."
"It's the perfect package and I'm honored every time you let me paint it."
Nagatoro's bashful smile complimented her glowing cheeks. "Okay, Senpai. You get bonus points for that one."
"I think I'll work from here." He set the easel down at a spot catty-corner to his model at the edge of the pool.
"Works for me. Did you bring rope? Or are you zip-tying me again?"
"I got something even better."
"Great, cause those plastic ties get nasty after an hour." Nagatoro rose from her perch and grabbed a blue bucket set atop the bench. She pulled out a pair of swim trunks and tossed them to the artist. "These are for you." She pulled a full bottle of tanning oil out of the bucket. "And this is for me."
Senpai changed into his swim trunks in the locker room, while Nagatoro spread tanning oil over her body. Moments later, Senpai walked back to his easel sportingly dressed in his trunks, and his shimmering model returned to her seat on the ladder.
"So how are you going to anchor me?" she asked.
"With tape." He twirled a roll of three inch wide transparent packing tape with his index finger. "This stuff is see-through so it shouldn't leave any tan marks."
Nagatoro rested her arms on the ladder rails. Senpai taped her to the silver tubes with loops at the wrists and below the elbows.
Once her arms were properly welded to the ladder, Nagatoro tested her bonds. "This works. What's your plan to get me out of this if Sakura blows the whistle?"
Senpai pulled a set of bandage scissors out of his pocket and snipped the air. "I'll have you loose in ten seconds."
"Aren't you going to do my legs?"
"Oh, right." He bent forward.
"Hop in. You're dressed for it, and it'll cool you down."
Senpai jumped into the pool, holding the tape roll over his head. With his feet flat on the bottom, his head stuck out above the water.
Nagatoro spread her knees till her calves pressed against the ladder rails.
"I usually tie your ankles together."
"You're painting me from an angle, so this pose won't look obscene."
"There's nothing obscene about your body."
Nagatoro blinked. "Wow, Senpai, there you go again."
Four more loops of transparent packing tape fastened her legs to the rails—two below the knees and two just above the water line. Nagatoro tried closing her legs, but they didn't budge.
"All good?" he asked.
"Three things. First of all, this cement is going to get hard on my butt after a while. How about we fold up a towel for a pillow?"
"Okay." Senpai retrieved a towel from the bench, folded it square, and slid it under his model's bottom.
"Second, finish oiling me. I couldn't reach my back." She glanced toward the bucket sitting at her side.
Senpai retrieved the bottle from the bucket, poured oil in his hand, and liberally spread it over his model's back. "What's third?"
"It's going to get super hot out here." She squinted up at the blazing sun. "So I need you to douse me from time to time."
"Should I do it now?"
"You may as well." Nagatoro raised her chin and closed her eyes.
Senpai dipped the bucket into the pool and drizzled water over his model, gently rinsing her face, hair, back, thighs, and breasts.
"That feels sooooo goooood," she sighed and shivered. "Thanks. Now get to work before I burn to a crisp." She winked.
Senpai jogged to his easel, picked up his brush, and placed the first strokes of color onto the canvas.
Nagatoro shifted her hips from side to side and hummed as the artist worked. "Hey, Senpai. Do you know how to play any instruments?"
"I tried playing the piano once, but lost interest."
"I see." She wiggled her bum on the soggy towel. Much of the water on her skin had evaporated.
"I could use another refresher," she said fifteen minutes into the session. "I've never stayed still out in the sun this long before. I feel like an ant frying under a magnifying glass."
"No problem." He set down his brush and doused his sizzling, squinting model once again.
"Thanks." She shot him a sly smile. "That hit the spot."
Senpai refilled the bucket and dumped the contents on himself. "I know what you mean about the sun. It's relentless."
"You better put some tanning oil on yourself too. Especially your shoulders. That white skin is going to burn."
"Okay." Senpai poured some lotion into his hands and covered his arms and shoulders before returning to his easel.
Nagatoro sighed as a brisk breeze cooled her body. Unfortunately, it also sped up the evaporation process, and she dried in ten minutes.
"I hate to bother you, Senpai, but…"
"It's no problem." He jogged over, doused her and himself, and jogged back to his work.
Nagatoro glanced down at her reddening breasts. A wicked smile formed on her lips as a devious plan formulated in her mind.
At the one hour and fifteen minute mark, she asked for her sixth dousing. "I hope I'm not messing up your rhythm."
"Not at all. It took a little longer because I painted your reflection in the pool water. But I'm starting touch-ups now."
"How does it look?"
"It looks amazing. You look so incredible in the sun, especially the way your skin is glistening. This is our best one yet. But my shoulders are getting kind of burnt."
"That's because you keep rinsing and washing off the oil. Your white skin is super sensitive because it's got no melanin to protect it from the sun."
"It must be nice to have a tan." Senpai grabbed the lotion bottle and poured some oil in his hand.
"Parts of me are as white as you are, you know." Nagatoro arched her back and thrust her chest forward, accentuating her glowing breasts. "I think your cello needs some attention."
"Oh, wow, I'm sorry. It really does." He glanced at his oiled-up hand, then at her perfect breasts. "Um…"
"I'd oil them myself, but…" She tried pulling up her arms.
"But…" He looked at his hand again, then met her eyes.
She giggled. "It's fine. It's not like you haven't touched them before."
He bent forward and reached down.
"No, Senpai. I'm not going to let you botch things up like you did with the sarong yesterday. This time, I'm giving you specific directions."
"Thanks. How should I… oil you?"
"First, sit down behind me, spread your legs, and scoot forward till your chest is touching my back."
Senpai did as instructed, the 'V' of his legs enclosing the 'V' of his model's legs.
"Good. Now there are two sensitive parts of me that are going to need your oiling attention. My chest and the region between my legs."
"Between your what?"
"Think of me as a naked girl cello that you're about to play."
"Um... okay."
"First, oil up both of your hands really well. Then focus on these three parts of your cello." She tilted her head to the side. "Play my neck and ears with your mouth and tongue, play my breasts and nipples with your left hand, and my slit and nub with your right hand. Do all three simultaneously while you hold me tight. Don't worry, I won't break."
Senpai scooted forward. "How will I know if I'm playing you right?"
"Listen to the music."
Without hesitation, he poured oil on his hands. "I'll do my best."
Nagatoro took a deep breath.
Senpai reached his left hand around and cupped his cello's breasts. Nagatoro moaned as he kneaded and squeezed them in turn, and peeped gleefully when he lightly pinched her nipples.
She gasped when his mouth gently clasped her neck and his tongue teased her skin. She groaned and tensed when his right hand reached down to massage her slit. She nodded lightly with eyes clenched shut when his fingers explored inside and chirped when his moist fingers exited to rub her nub.
It took him a little while to get acclimated to his instrument, but the audio and tactile feedback he received helped him improve his technique minute by minute. Nagatoro responded to his touch with gasps, sighs, and moans, and the motion of her torso and hips guided him as she moved in concert with his hands.
As the artist played his cello, its audio output gained volume, intensity, and urgency, while their improvised melody ramped toward a thundering climax.
"OHHHHHHHH."
His instrument shook, cried, and tensed.
"Senpai, cover my mouth," she whined as her body shivered in his arms.
"What?"
"Cover… OHHHH… cover my… AAAAHH-mnngggfff!"
Senpai did as instructed as Nagatoro arched her back, raised her hips, and clenched her fists. Instinct told him their song had not yet ended. He continued strumming her lower chords as her frame convulsed, the ladder shook, and muffled screams moistened his hand. He maintained the offensive and held her tight though she writhed and fought against his efforts and her bonds.
Instinctively knowing she'd reached her peak—and likely shot a good distance beyond it—he eased off and let her collapse in his arms.
He uncovered her mouth.
"I need to get in the water," she gasped, glassy-eyed, between heaving breaths, her face and body flushed. "I need to get in the water right now. Please, Senpai."
"Understood." He hopped to his feet and fished his bandage scissors out of his pocket. As Nagatoro glanced from side to side, he snipped away the tape welding her arms to the ladder. Then he jumped into the pool and reached up to cut away the tape binding her legs.
Once free, Nagatoro's eyes lit up like a Bengal tiger's. She dove onto Senpai and wrapped her arms around his neck and her legs around his torso.
While somehow managing to maintain his balance, he held her tight around the waist.
"Anyone that can make a girl come that hard deserves a big reward."
They locked lips and intertwined tongues as he carried her around the pool, her breasts compressing into his chest, her legs squeezing him tightly.
Something hard jabbed Nagatoro's bottom. She reached down, slid her hand into his swim trunks, and took hold of the hard object in question. Meanwhile, Senpai freed an arm and pushed the waistband of his trunks down to his thighs.
SCREEEEEEECH!
The ear-splitting sound of a whistle quickly brought all aquatic activity to a halt. Nagatoro pushed off of Senpai, ducked under the water, and swam away. After tugging the waistband of his swim trunks back to waist-level, Senpai ditched the pool and scampered toward the locker room.
Nagatoro surfaced at the far end of the pool to find Sakura standing on the other side of the fence with her hands on her hips, wearing a disapproving frown.
"Hey, Sakura-chan." Nagatoro waved with a sheepish grin. "I took your advice. Well, most of it."
Author's Notes: It's interesting how people often compare a woman's figure to a cello or a guitar. Do a google image search on "bellanuda cello" and you'll see the picture I imagined Senpai referring to. Thanks for checking in again. See you all next week! — SK