"Huh?" The paler turned around to see the other gripping her shoulder. "When did I say you could use the bathroom?" she sternly questioned her. "You didn't?" Nagito replied, rather confused. "Exactly," the hazel eyed one continued on. "So don't you dare." "B-but, I really have to go..." the petite one pleaded. "Well, you're not. Not in the bathroom at least." this response, while it did confuse Nagito, worried her as she had a feeling she might actually know what it meant. Surely, she couldn't just hold it in. Holding it in only stimulated her, which, considering whom she was alone with, was just plain embarrassing and frustrating. By the next minute, the slim one's shorts were stained with a slightly darker patch. As the substance gradually cooled, her face heated up. Hajime noticed this, turning to look at the result of Nagito's decision. "Oh? You wet yourself without my permission?" the curvier of the two wandered over to the blushing female, leaning into her ear. "What a naughty girl. I'll have to punish you for that." Hajime took her by the wrist and led her over to her own cottage, down to the dark room (I might aswell just call it a sex dungeon because it basically fucking is).
Not long after they arrived, the brunette had stripped the flushed one and cuffed the pale wrists and ankles to the stone wall, her legs spread wide open. Her dull eyes followed the brighter eyed to a wooden cupboard (that's a closet if you're american), where she took out a bottle filled with a bright substance. Nagito realised it was one of the bottles from the dark room that was swarmed with tentacles. However, she couldn't see a label on it so, with a few nervous shivers, she asked: "What does th-that do?" Hajime smiled, removing her underwear and gulping down the contents. "You'll see~" Within the next 10 seconds, the bustier one started wincing, her breathing increasing at rapid rate. There were some rather odd noises, leading the small-breasted one's eyes down to the other's crotch. She was shocked as she watched a deep pink coloured object, with what seemed liked several smaller light pink tentacles wrapped around it, emerge from the drugged one's clit. When it was fully out, it was very thick and about 8 inches long. The white-haired girl's eyes widened. "I-is that...what I think i-it is?" Hajime answered, to Nagito's dread: "If you were thinking it's a huge tentacle futanari dick then yeah."
"B-but why did you want to gain something like that?"
"So that I can impregnate you with your own tentacle offspring to give birth to, why else?"
"W-why would you want to do something as messed up as that?!"
"Well, Teruteru was complaining that the tentacles in that room were starting to die off and needed some new ones. Plus, I really wanted to try out a bunch of these drugs anyway."
The futa paced herself over to her quivering mate, carefully pulling the sides of her vagina apart to reveal her entrance. The glistening tentacle's head entered.
"N-no, don't! I don't want to get pregnant with tentacles! And the last time one was inside me, it was so s-slimy and messy!" the sub pleaded, blush and fear all over her face. The futa kept pushing in though, hearing the sub squeak and whimper.
"Mmn! A-aah! Stop! It's too b-big. Please don't s-stretch me like that! A-aaah!"
It slid all the way in and while gripping onto the lighter one's thighs, the futa began thrusting.
"N-aah! A-aaah~! No. Aaaah~! Why does it- aah! -feel so good- aah~! -when it's so- u-aah! -gross and perverted? A-aaah~!"
"You already know why. Because you're a sex-hungry, masochistic, little whore."
"I-I'm not-"
"Don't argue with your master!" The darker haired one gripped tighter on the milky thighs and began biting along her slave's neck.
"A-aah~! M-mmm!"
The thrusts then became faster and harder, pounding into the slender slut.
"AHH! M-master, don't go so fast! A-AAAH! I can't take it! AAAAH~! I can feel it- haaah~! -sliding in and out of me! Ha-AAAH~!"
"And you love it, don't you~?"
"N-no. AAAH~! I hate the- HAAAH~! -slippery sensation- AAAAH~! -so much!"
"Oh, come on~" The futa pressed her larger breasts up against the other's. "How long are you going to keep acting so innocent? Not that I'm complaining, seeing you resist in embarrassment is so cute~"
"U-uh...I..." the petite one's face was beyond heating up, as she was teased by Hajime's words and the huge, soft boobs being practically pushed into her face. The hazel-eyed one let out a small laugh, as she kept leaning in, massaging the smaller set of boobs and teasing the nipples.
"A-aah~ M-mmm~!"
"Hmm...I wonder. I think I still have that breast milk of yours refrigerated somewhere. I could use that for a while, but after that..."
"Huh? You kept that stuff refrigerated?! And use for what?"
"Well, the tentacles would need to consume something. But once they've developed enough, they'd need to move on to something else."
"Y-you can't do th-that!"
"If that's the case, I can't wait to see how you react when they have to start feeding on the next thing!"
"And...what would that be?"
In order to provide a reply to this, the futa reached down to where she was penetrating the blushing one and slid her finger between the wet folds, before holding her hand up in Nagito's face, the substance dripping onto her dainty chest. "This, of course~" Nagito was met with even more shock and embarrassment, but Hajime, licking the mess off of the white flesh, simply returned to grasping her mate by the thighs and thrusting inside at an intense speed.
"A-AAAAAAAAH~! N-no! AAAAH~! You can't do that! HAAAAH~! You'll g-get me- HA-AAAAAAH~! -pregnant if you're- AAAAH! -not careful!"
"That's exactly why I'll be sure not to pull out for some time after climaxing."
"But-"
The frightened was interrupted by the reproductive tentacle organ being slid all the way in, then all the way out. Slipping in and out in a torturous fashion.
"A-aaah~ MMM~! Aaaah~ Aaah~ Mmmmm~ Haah~!"
The futa kept this up for a minute or 2, until she added in the element of slamming back in afterwards.
"Aaaah~ AAH! N-not so- M-mmm~ -hard! MMM! A-aaah~! HAAH~!"
The pace was soon picked up from there though, the shorter haired one slamming in and out wildly.
"A-aaah! AAAAH~! AAAAAAH~! Oh my- A-HAAAAAAH~! Too- AAAAH! -good! HAAAH~ I don't- A-AAAAH~ -care anymore. HAAH~! More, Master! AAAAAH~! More~! MMMM~ Yes~ AAAAAAAH~! Yes~! YES~! AAAAAH~! Give it to me~! AAAAH~! AAAAAH~!"
Hajime could feel herself getting close to finishing. "Perfect." she thought, leaning next to the orgasming one's ear. "I'm gonna cum~"
The girl that was squealing in pleasure just a moment ago, quickly switched to panic. "AAAH! S-stop then! AAAAH~!"
"Definitely not. I said I was going to impregnate you so that's what I'm going to do."
The thrusting continued, relentlessly.
"AAAAAAH~! NOOO~! HAAAH~! YOU CAN'T~! AAAAAAAAH~! DON'T C-CUM INSIDE ME~! AAAAAAAAAH~! NOOOO~! HAA-AAAAAAAAAH~!"
Cum. Shooting into the other, filling her to the brim.
Tears were in the corners of the hazy green eyes. "AAAAAAAAH! A-aaah! No! Get it out!"
"Sorry, it's done now. Looks like you'll have to have those tentacle babies."
The futa pulled out of the shaking sub. The tentacle dick soon disappearing after. The skinner one was still shivering, along with her thighs spasming as the curvier uncuffed her, allowing her to drop herself to the floor. She sat there, on the cold stone, her legs wide open for a few minutes. Once she had caught her breath, she turned around to find Hajime no where in sight. However, she did see a new, empty glass bottle next to her. She also noticed a weird, unfamiliar feeling in her vaginal walls, and it wasn't the cum...
(Yes, it's a cliffhanger. Deal with it! Also, I challenge anyone to figure out what the new drug did.)