Hatsushimo had been a busy girl. The past few days, and even this day, had seen her out on sortie after sortie. She was relieved after returning today to hear that she'd be off for the next few days, which would allow her to get some well-needed rest. As much as she loved serving her friends and her commander, time to recuperate was always well appreciated.
And so it was that she was outside on one of Truk's beaches, relaxing under the shade of a tree. The lapping of the waves against the shore was such a soothing sound, one that Hatsushimo rather much enjoyed. Far in the distance she could see a few other shipgirls on the beach, what appeared to be a few destroyers and a battleship, but they were too far away to identify.
Hatsushimo could hear someone approaching and turned her head to see that it was Wakaba, and Hatsushimo smiled at her. "Hi, Wakaba-neesan. Come to relax with me?" Hatsushimo asked, and Wakaba stopped next to her. The two of them quietly regarded each other, and Hatsushimo waited for Wakaba to reply.
"Come with me, please" Wakaba said, and turned to walk back the way she'd come. Hatsushimo stood, confused, and wondered what Wakaba wanted. She followed her sister back into the buildings of Truk, and Wakaba led her to one of the installation's empty classrooms.
"What's all this about, Wakaba-neesan? Do you need help with an assignment?" Hatsushimo asked, and Wakaba shut the door. She walked over to the teacher's desk and sat down on it, her hands in her lap. Hatsushimo folded her own hands together in front of her, again waiting for Wakaba's reply. It was just the two of them in the room, so Hatsushimo figured it was important.
"I want to have sex with you" Wakaba said, and Hatsushimo blushed. Wakaba spread her legs, her skirt falling between her thighs. She reached down and lifted the hem, showing her black panties to her sister.
"Oh... Uh, OK" Hatsushimo replied, and unzipped her skirt. It fell to the floor and Hatsushimo lowered her panties enough to free her soft cock, though it was already beginning to harden. Wakaba slid her own panties off of her and flipped her skirt, and Hatsushimo stared at Wakaba's pussy as she pressed and prodded her cock to her sister's entrance.
Wakaba put her hands on Hatsushimo's shoulders and stared into her eyes, which made Hatsushimo a little bashful. Hatsushimo pushed and her cock slid into Wakaba, making her sigh contentedly. She started plunging in and out, slowly, her hands on Wakaba's midsection.
"That...feels good" Hatsushimo said, though Wakaba didn't reply at all. She continued to stare into Hatsushimo's eyes, and Hatsushimo gave her sister a quick kiss, which Wakaba returned. "Um, does it feel good for you? Should I go faster, or slower?"
"Choke me, please."
"W-What?!"
"I want you to choke me."
"But... I don't want to hurt you..." Hatsushimo said, but slid her hands up to Wakaba's neck anyway. She had her thumbs near the front of Wakaba's throat, her fingers on the sides of Wakaba's neck. "What if you want me to stop...?"
"If I want you to stop, you'll know. Please begin" Wakaba said, and Hatsushimo did as asked. She lightly pressed her thumbs into Wakaba's neck, her fingers tightening in response. She had stopped thrusting, her cock buried and twitching in her sister's pussy.
"Harder, please. Keep thrusting."
Hatsushimo nodded and pressed her thumbs further and harder into Wakaba's throat. Her fingers gripped harder, and she could feel Wakaba's throat bobbing and flexing as she struggled to breathe, and one of Wakaba's hands wrapped around one of Hatsushimo's wrists, grasping it tightly.
"Harder..." Wakaba wheezed, her expression mostly unchanged from when they'd began. Hatsushimo started slowly thrusting again, finding it a little hard to focus on thrusting and choking. She wrapped her hands even tighter around Wakaba's neck, the other girl's breathing audibly strained. "Feels good..." Wakaba said, and closed her eyes.
Hatsushimo settled into her rhythm, her pace a little quicker. She agreed with her sister about the sex feeling good, but she still felt weird about choking Wakaba as they made love. Her and Wakaba had made love a few times before, usually before or after missions as a way to bleed off stress, and Wakaba had always wanted her to be a little rough. Grip her hips or thrust a little hard, or pin her down, that sort of thing. She'd never asked Hatsushimo to choke her before, though.
"Is that enough, or...?" Hatsushimo asked, and Wakaba's eyes fluttered open. She gripped Hatsushimo's wrist harder and Hatsushimo took that to mean Wakaba wanted her to choke harder, so she obliged. Wakaba's breathing became even more strained, each breath a high wheeze and very deep, Wakaba's body reflexively trying to draw in as much air as it could.
"I want...you...to spank...me...later..." Wakaba said through strained breaths, and Hatsushimo slowed her thrusting. Now she wanted her sister to hit her?! Everything she did as a fleetgirl, she did to protect others. It was weird to her that one of her fellow shipgirls wanted her to hurt her, even in a safe setting.
"Wakaba... Are you sure about this..." Hatsushimo said, and Wakaba gazed lovingly into her eyes.
"Fuck me harder... Choke me harder... Hatsushimo-chan..." Wakaba said, and closed her eyes again. Hatsushimo happily started thrusting faster, her hands as tight around Wakaba's throat as she could get them. She pressed her thumbs as hard as she could, and Wakaba's eyes started watering.
"Ha- Hatsu-" Wakaba said, now audibly gasping. The hand around Hatushimo's wrist was tightening, Wakaba's other hand digging into Hatsushimo's shoulder. Hatsushimo felt Wakaba's pussy tighten and spasm around her cock, her sister silent save for her struggled breathing as she came. Hatsushimo gasped softly and moaned, her own pleasure mounting.
"Mmmhh, Wakaba~" Hatsushimo said, and she closed her eyes as well. She brought her hips to Wakaba's again and again, pushing as much of her cock into her sister as far as she could each time. She held onto Wakaba's neck as hard as she could for stability, the feeling of Wakaba's tight pussy surging through her body on each thrust. "C-Can I finish- HMMM! Inside you, Wakaba?"
Wakaba opened her eyes a bit and closed them again, and Hatsushimo continued thrusting. She knew that futagirls couldn't impregnate other girls, but she always liked to ask for permission. Plus, there'd been times when Wakaba had specifically asked her to pull out before cumming, usually because she wanted Hatsushimo to cum on her face.
"I love you, Wakaba..." Hatsushimo said, and tried to kiss her sister again. Wakaba stopped her, and Hatsushimo looked at her, confused. The hand on Hatsushimo's wrist traveled to one of her cheeks, and Wakaba smiled at her. Hatsushimo smiled back, still gripping Wakaba's neck as hard as she could. Hatsushimo could tell her sister loved her just as much as she did, and Hatsushimo appreciated that. She squeezed her thumbs in just a little harder, the sound of Wakaba's choking turning her on a bit more.
Hatsushimo yelped and moaned girlishly, her orgasm approaching. Her cock dipped in and out of her sister's sticky pussy, some of Wakaba's fluids connected to Hatsushimo's hips by thin strands. Her cock flared and she pressed every last inch of her cock into Wakaba, her head thrown back and loud moans and shouts echoing in the room as she emptied her spunk into Wakaba's snatch, her hands trembling.
Her orgasm soon ended and Hatsushimo was left panting, some drool leaking down from the corner of her mouth. She licked it up and her eyes half-opened, her hands still gripped hard around Wakaba's neck. Her sister was still struggling to breathe, but hadn't made any move to stop Hatsushimo, so Hatsushimo figured she was OK. She released her hands from Wakaba's throat and Wakaba took a deep breath, looking a little lightheaded. She at last let Hatsushimo kiss her, the two of them making out for a moment.
"Thank you, Hatsushimo" Wakaba said, her hands on Hatsushimo's shoulders. "I'm ready for my spanking, please."
Hatsushimo nodded and pulled back from her sister, her sensitive cock popping free and causing her to yelp softly. "Um, how do you want to..." she said, and Wakaba hopped down off the desk. She turned around and leaned forward against the desk, propped up by her hands. She kept her knees and ankles together and her butt stuck out a bit.
"Don't hold back, please" Wakaba said, and Hatsushimo nodded. She put a hand to the tiny cheeks and stroked a bit, telling herself that it was OK, that Wakaba wanted it, and that she trusted her to respect her boundaries. She gave Wakaba's butt a light tap, followed by a firmer one, and then another. She gently patted her sister's tushy, and Wakaba squirmed.
"Harder. Like you mean it. I deserve it..."
"OK..." Hatsushimo said, and swatted a little harder. She was already getting hard again but chose to ignore it; right now it was all about Wakaba. She brought her hand against Wakaba's butt harder and harder, eventually properly paddling her sister. The small but plump cheeks jiggled lightly on each swat, and Wakaba hung her head.
"You're... You're a bad girl, Wakaba. I hope you know why I'm... Why I'm punishing you" Hatsushimo said, unsure of herself. Truth was, the reason she was doing this was because she loved her sister and wanted to make her happy, and she was sure that Wakaba knew that. Wakaba seemed to appreciate Hatsushimo chiding her, though, eliciting a slight whimper. She bent forward all the way over the desk, her breasts and stomach pressed to the wood, her head resting on her folded arms. Hatsushimo paddled her over and over, Wakaba's butt slowly turning red as she shed her inhibitions and really gave it to her sister.
Soon Wakaba started squirming, mostly silent during her spanking but very clearly enjoying it. From her angle beside her sister Hatsushimo could see Wakaba's pussy was dripping quite a bit, her fluids trailing down her thighs and legs, and Hatsushimo wondered just how long Wakaba wanted to be spanked for. "It hurts, Hatsushimo, but... It's not so bad..." Wakaba muttered, her eyes closed.
"I love you, Wakaba, and I hope you'll learn your lesson from this" Hatsushimo said, and Wakaba moaned.
"I'm a bad girl..." Wakaba whispered, almost drowned out by the sharp smacks to her bottom. Hatsushimo paid close attention to her sister's expression, trying to make sure she wasn't hurting her sister too bad. Wakaba, however, turned her head and buried her face in her arms, and so Hatsushimo was left staring at her sister's tush as it continued to glow red.
After several minutes Hatsushimo slowed her paddling, her swats coming lighter and lighter until she was finished and started tenderly stroking Wakaba's butt. Wakaba picked her head up but looked away from Hatsushimo, and Hatsushimo gave her tushy a light swat, earning a soft gasp. "Did you learn your lesson?"
Wakaba nodded, and Hatsushimo stroked her butt a little more, soothing the stinging. Wakaba slowly eased up off the desk and stood upright, now looking down at the floor. Hatsushimo crouched down and picked up Wakaba's panties, her face right next to her sister's red bottom. "Put your undies back on now, Wakaba" Hatsushimo said, sternly but softly, and Wakaba did as told. She slipped her feet into the legholes and Hatsushimo slid her panties back up for her, helping her adjust them. Hatsushimo then did the same for herself, making sure her skirt was back in order as well.
Wakaba turned around and hugged her sister, and Hatsushimo did the same, stroking her sister's back. "I love you, Wakaba-neesan. I love you so much."
Wakaba pulled back, a rare smile on her face, and the two of them shared a kiss. "I love you too, Hatsushimo."
Hatsushimo smiled as well. "I hope you're satisfied. I'm not used to doing stuff like that, but... It was fun! Would you maybe like to go get something to eat together?" Hatsushimo said, and Wakaba nodded gratefully.
"Thank you, Hatsushimo. I'd very much like to eat lunch with you, though I'm not sure I'll be able to sit down."
"Aheh, well, I guess we'll go sit out on the beach then. That shouldn't hurt as bad, eh?" Hatsushimo said, and the two of them left the classroom and headed for the dining hall, holding hands the whole way there.