All characters in this story are over 18. While the setting is High School, people in this futanari world don't attend high school until they are 18.
*****
Umi sat alone in an empty subway car. She stared at the seat across from her and hit the back of her head against the cushioned seat in frustration.
The rest of the day had gone fine. During the tour, she saw the rest of what the school had to offer. There were rooms for a multitude of classes and clubs, a theatre, a gymnasium, an art room with a large kiln, and so on. The entire building was square shaped, and in the center was a courtyard. Behind the building were fields for a variety of sports.
Umi was amazed by the school, but her amazement was dampened. The entire day, even after she had done the tour, returned to class, went to lunch, and returned to the class again, and was given free time until the end of the day, she had not managed to get herself to talk to Reena. In fact, she talked to no one. She sat at her desk with her head down and played a game on her phone. She was so frustrated with herself she wanted to cry.
The subway came to a stop and Umi trudged out of the car. The terminal was almost empty, with a few other people getting off and on the other cars. She walked up the steps to the sidewalk and dragged herself home, dwelling on the thought that her lonely school life was already set in stone.
Umi opened the gate to the yard, unlocked the door, and headed straight for the stairs.
"Umi, is that you?" Umi's mom Mina came around the corner as Umi was halfway up the stairs. "Aren't you going to come talk to me? I want to know how your first day went."
"Mmm." Umi mumbled and she walked to the top of the stairs.
"It's alright. Take some time to unwind. We can talk over dinner."
Umi nodded her head.
"Taki will be home in a bit. Why don't you two take a shower before dinner."
Umi stopped for a moment to mumble a reply before she walked into her room, set her backpack on the ground, and threw herself face down onto her bed.
She laid on her bed for a while before she sat herself up on the edge. She rubbed her eyes and shook her head, trying to reinvigorate herself. Having a moment to calm down and think clearly, her situation did not seem so bad. She could talk to Reena tomorrow. Just tell her it was a misunderstanding. She was just nervous, and she did want to be friends.
Umi let out a sigh. It seemed so simple and easy. Why could she not do it?
The sound of the front door opening grabbed Umi's attention. Taki was home. She felt a surge of excitement and began to strip naked. She threw her clothes into the hamper and sat back down on her bed wearing only her cock sock. She spread her legs and her sensitive balls tingled as they brushed against the side of the cool bed.
It was her favorite part of the day. Finally having a chance to let loose her unwieldy dick after a long day had her trembling with excitement. She untied the string and grabbed the tip of her cock sock and began to pull.
"Mmm." Umi shivered as she slowly slid the tight sock off. Intense arousal washed over her as her sixteen-inch cock began to swell. She could feel her body heating up from the base of her cock, and she teased her nipples. The more she pulled the sock off, the more she became erect and the tighter the sock became.
Almost off, the end of the sock became stuck on Umi's engorged glans. She took a firm grip of the sock with her right hand and pinched her nipple with her left. In one swift movement, she yanked the sock off the rest of the way as she twisted her nipple as hard as she could. Her entire body shuddered from the intense sensation, and she let out a long, pleasurable moan.
Umi was finally fully erect. She grabbed it with both hands, and effortlessly brought the tip of her almost two-and-a-half-foot long cock to her nose. She opened her mouth and slowly ran her warm, wet tongue along the underside of her glans. Her entire body tingled as she suckled the tip and tongued the opening of her urethra.
Umi opened her mouth as wide and she could and swallowed the head of her cock. She gently gnawed with her teeth while she ran circles with her tongue. Her jaw began to ache, and she popped the head of her cock out of her mouth. Saliva ran down the length of her dick, and the cool air hitting it made her tingle and shiver.
Umi leaned back and stared at her massive, throbbing, wet dick. With a finger, she traced a small vein along the top, causing her cock to twitch. As she was trying to think of what to do next to tide herself over, her sister Taki stepped into her room.
Taki stopped and sized up Umi's towering erection.
"Wow," She said, "Stressful day?"
Umi nodded in reply.
"Go get the showers started, I'll be in in a few minutes."
"Ok."
Taki left and Umi stood up. The length of her protruding erection made it difficult to walk without hitting things. She grabbed her cock with both hands and hugged it against her chest. When standing, the head of her erect cock just brushed her chin. She could feel the heat emanating from it against her stomach and breasts. It was times like these that Umi really wished she had slightly bigger tits. Just big enough that she could give herself a tit job and suck herself off at the same time.
Umi stepped out of her roomed and glanced into Taki's just to her right. Taki had just taken her shirt off, and the view of her tight, toned body made Umi even hornier. The fluids from her pussy began to run down the backside of her balls and drip on to the floor.
Umi quickly made her way to the bathroom, dick held tightly against her. She was very careful whenever she was fully erect. A history of having a bruised dick from hitting walls and furniture had taught her not to be hasty when horny.
She entered the bathroom, walked past the sink, and opened a sliding glass door to a large open bath. On the control panel by the door, she adjusted the temperature and hit start. In the middle of the room was a pillar with four shower heads that came to life, spraying water in all four directions.
Umi walked around the pillar, letting the hot water from each shower splash against her naked body. She stroked herself as she walked, keeping herself ready. A few minutes later, Taki entered the bath.
Taki grabbed soap and shampoo out of a basket on the wall and stepped under the warm water.
"Oh, god that feels good." Water ran down her body, following the lines of her toned muscles and abs. Water droplets bounced off her firm breasts and dripped form her nipples. She ran her hands through her short, dirty-blonde hair, down her sides, across her thighs, and up her dick.
"Can we... first..." Umi gently stroked herself, her eyes fixated on Taki's firm ass.
"No." Taki replied. "Wash first then fuck."
"But..."
"No, Umi. You're barely functional for a good hour after you cum. I don't want to have to wash you again."
"Okay..." Umi let out a sigh. She sat down on her small bath stool and began to slowly wash her long hair. Her cock shrank until she was barely half-erect, and she silently stared at the floor.
Taki rolled her eyes. She loved her sister, but she sometimes got tired of how depressed and defeated she acted.
Taki grabbed the bar of soap and lathered her hands. She gently coated her breasts, making sure Umi was watching. She lifted and squeezed her perky tits as she covered them in soap. She traced her nipples, then squeezed and pulled on them until they were hard. She worked her way down her body, slowly and deliberately rubbing soap against her abs.
Umi gnawed her lower lip. Fit tone bodies had always been her weakness, and she desperately wanted to shove her face into Taki's stomach.
Taki turned away from Umi and began to soap up her legs. She bent over to get her feet, keeping her ass high on the air. Umi was sitting at eye level with Taki's tight pink pussy.
Bent over, Taki's hands moved up her legs until she was rubbing her inner thighs. She moved to her dick and she began to lather and stroke herself, cradling and clutching her balls. She slipped her hands through her legs, put her fingers into her pussy, and pulled them apart, giving Umi a perfectly clear view deep into her gaping pussy.
Umi washed herself as fast as possible. Her waning erection was now harder than ever, and her desire to fuck was so intense her balls ached. She finished her hair and quickly soaped herself up. Her dick swung wildly as she moved, and she knocked over the small plastic stool she had sat on without even noticing.
As Taki washed her hair, should could not take her eye off Umi's erection. Her sexy soaping had made her just as horny as Umi, and more than just shower water was pouring down her inner thighs. Her own dick trembled and throbbed at the thought of Umi slamming her massive cock deep inside her, punching past her cervix, and pounding the inside of her womb. She wanted to fuck the second she got into the shower, but she held off.
Taki restrained herself because when Umi cums, she cums a lot. She turns into an unstoppable sperm pump for almost a minute straight. Her family had measured it a couple of times, and Umi's average load was over four gallons. Just the precum alone was more than what the average person came.
The downside was that Umi could only cum once a day, and when she was done she was unable to move or would just pass out. Umi loved it, but Taki would then have to drag her to bed or finish washing her, which was a near impossible task when her own womb was inflated with gallons of cum, causing her to orgasm over and over again.
"I'm done." Umi stood behind Taki, and her massive cock slid in between Taki's thighs. Taki looked down to see her own dick and balls resting on the Umi's thick girthy shaft. She trembled in anticipation.
"Just a second. Let me get ready."
"You are ready." Umi replied as she rubbed her massive dick between Taki's thighs. "We aren't under the shower anymore, but my dick feels like it is."
Umi was right. Her dick was completely covered in Taki's wet, sticky juices, and the flow was not stopping.
"Alright, alright." Taki pushed Umi back and her dick slipped out from between her thighs. "Sit down."
Umi nodded and sat on the floor. Her massive cock bumped her in the face as it swung upward. Taki stepped over her and lifted her own balls out of the way. Umi grabbed her dick and moved it so the head rested against Taki's labia.
