Lucy now found herself in the hallway once more, quietly shutting Luna and Luna's door behind her. She figured she'd head for her eldest sister's next since thier room was the closest, however Lisa suddenly emerged from the household's singular bathroom. In classic fashion Lisa jumped back a bit with a yelp only now noticing Lucy as she bumped into her,
"Oh-Oh thank heavens for a second I thought you were a specter. Of course I do not believe in superstitions, but my vision impairment is quite tedious to deal with at night" Lisa said dryly catching her breath,
"How would you have bumped into a ghost?" Lucy responded with an obscured raised eyebrow,
"Touché, anyway what has you haunting our hallway in the dead of the night?" Lisa replied with her own question. Lucy froze now as she couldn't find the words to explain to Lisa she had been on a sexcapade with their siblings. Lucy's still throbbing cock jumped in her sweatpants as if demanding to be set free,
"U-Uh well I was just-" Lucy began while covering her tent with the tome,
"Hold that thought why is there a concentrated aroma of androstenedione and estratetraenol emitting from you? I would not pry and assume you had a nocturnal emission however you are not in the stage of puberty. Moreover, you are not a male-" Lisa had cut Lucy off but was now cut off herself as Lucy dragged her by the arm. Once they were securely in Lisa's and Lily's room she released her and the door to the room shut close again. Lisa flipped the light switch in the room and adjusted her specs,
"That was quite uncalled for, b-but now my questions are somewhat answered..." She finished stuttering as her gaze was drawn to Lucy's tent,
"It's a long story, but I'll cut it short..." Lucy breathed in deeply. She rested her tome on Lisa's work table which was filled with beakers and other scientific apparatus. Lisa's eyes bulged and her face became hot as Lucy pulled her sweatpants down,
"Great S-Scott! It's true you have a phallus and it's well a-above average...~" Lisa's specs became foggy with delight and curiosity. She slowly made her way towards Lucy, swallowing as the powerful scent from before entered her nostrils. Lucy's member twitched in Lisa's small hands as she began examining it,
"R-Reamarkable it's clearly real but how, I c-cant bring myself to stop touching it..." Lisa cooed losing her train of thought as Lucy's scent clouded her mind. Lucy smiled down at Lisa and a satisfied grunt left her lips as her foreskin was pulled back,
"My word c-could this be a result of my experiments? Perhaps this is a mutation brought about by radiation-" Lisa continued but was stopped by Lucy digging her fingers in her hair,
"Lisa, you talk to fucking much...~" Lucy swore pushing the tip of her cock to Lisa's thin lips. Lisa hesitated for a moment but parted her lips as a pink aura surrounded her. Lucy now moaned as she pushed her length into her younger sister's moist warm cave. Lisa gagged as her eyes became a clouded mist of rose, Lucy had put her under a deep trance. Lucy began thrusting in and out of Lisa's petite mouth, drool flowed from Lisa as she sucked obediently,
"That's a good girl but I'm sure you can t-take more...~" Lucy panted. Lisa's only response was a muffled moan as she begin swallowing Lucy's entire length slowly. Lucy threw her head back and pushed Lisa's head down until her nose pressed against her groin. Lisa's throat bulged as Lucy's cock was lodged completely inside it,
"Y-yessss that's it you love my cock in your throat you g-geek ohhh!~" Lucy moaned thrusting her hips again. If anyone was passing by they'd hear lewd, obscene gagging and slurping as Lucy fucked Lisa's throat drunkenly. She was loving the sensation of have her entire cock squeezed and swallowed over and over by Lisa's petite gullet. Lisa gave no struggle as her mouth was being used like a complete whore, moans and shorts gasps for air was all she could muster. Lucy grunted as she felt her balls contracting and her toes curled,
"S-Shit I can't hold it I hope your hungry a-ahhh!~" Lucy moaned aloud slamming her entire length balls deep into Lisa's throat. Lucy kept her cock hilted as she feed Lisa gallons of her rich warm seed now. Lisa's eyes nearly rolled to the back of her head as she was forced to swallow the thick substance. Her throat could not keep up as cum oozed from her nostrils. Lisa's stomach bloated as Lucy came every last drop in her throat. Lucy let out a long satisfied moan as her limp cock slipped from Lisa's throat. There was a loud wet pop and Lisa immediately began coughing for air,
"W-What...cough...where am I-I?!" Lisa sputtered with a mouth full of cum as pink the aura and mist in her eyes faded. Lucy still recovering from her orgasm gave a horse snicker,
"Don't y-you remember sister, you gave my cock quite the spit shine hahahah...~" Lucy responded. Lisa blushed hard as she tasted Lucy's cum and rubbed her bloated belly,
"I-Impossible, I had absolutely no control o-over my body. What k-kind of, I don't fully u-understand but you are behaving quite erratic sister..." Lisa stammered pushing a button underneath her bed from where she had sat. A series of mechanical arms sprang from underneath Lucy's feet and clamped around her wrists and ankles effectively restraining her. Lisa wobbled over now and spoke,
"Until we discover the root of this transformation and neutralize it. I have no choice but to detain you sibling" Lisa adjusted her specs trying to regain her composure,
"Oh that won't do my libido has barely been satisfied. On the contrary..." Lucy began with each of her words having the effect of an echo, "There's still more of our siblings to play with and what I am couldn't be explained with your silly science..." She smirked devilishly. Lisa looked on in sheer disbelief as the mechanical arms that had restrained Lucy shone a faint red hue before melting onto the floor. Lucy's body now underwent a change, her breasts became more full and round as did her ass. Lucy then slowly increased in height until she was the size of Luna and Luan roughly. Her arms, abdomen and thighs became more toned as well,
"Now then, what was you saying about superstitions sister...?" Lucy grinned in her normal tone as her cock became rock hard again. Lisa turned to run as fast her little legs could take her but was grabbed by her hair,
"Unhand m-me! This is absolutely i-immoral and-" Lisa began to shout but was cut off Lucy slamming her onto the bed. In a instant Lisa was put into a mating press with her lags pinned behind her head. Lucy loomed over her with a glint in her eye while the tip of her cock kissed Lisa's pussy,
"Oh shut up you were gagging on my cock so obediently before. I'd put you under again but I'll admit hearing your pathetic pleas is arousing...~" Lucy grinned. Lisa bore her teeth and moaned helplessly now as Lucy buried her cock into her pussy. She could feel her tip kiss her cervix although Lucy was only halfway in. Lucy let out a dissatisfied grunt Lisa was much tighter then the other's,
"N-No I want deeper mmpff!~" Lisa exclaimed whilst forcing the rest of her cock into Lisa's womb. Lisa was about to let out a cry but was stopped by Lucy placing a kiss on her. Tears steamed down her cheeks as Lucy pumped her cock in and out of her now. Lucy's length bulged her stomach each time she slammed her hips down. Lisa's pussy was being stretched painfully and her womb was being ruined. The bed creaked loudly and lewd clapping echoed in the room as Lucy's huge balls slapped against Lisa's ass. Lucy began thrusting faster Lisa's walls were gripping her grith so tightly,
"Y-Yes cum I can feel you're ahhh going to squirt all over my cock mmm!~" Lucy moaned with a grin. With another powerful thrust Lisa came drenching Lucy's length while her legs trembled,
"G-Good girl here's your treat a-ahhhh!~" Lucy moaned aloud cumming now herself. Keeping her full length buried in Lisa's snatch she pumped her womb with thick gallons of her warm seed making her even more bloated then before. Lisa's eyes rolled up as Lucy pulled out, huge gobs of her cum seeped from her pussy. Lucy's eyes glowed a reddish hue underneath her bangs and her nails grew out slightly jagged. She also felt her teeth sharpen, her body became warm like at first when she grew her cock but this time it much more bearable. With all the clamor Lily had awakened and stood in her crib babbling incoherently. She was much to young to realize what was going on, seeing her older sister she made cooing noises and giggled outstretching her arms to be picked up. Lucy smiled and walked over to her adorable sister,
"Loosey" Lily babbled whilst grabbing at the air,
"Hello sister did your noisy siblings wake you up aw come here hehe~" Lucy talked softly picking up her infant sister. Lucy knew Lily was fast learner for her age this could be interesting to teach her how to pleasure a cock. Lucy sat on the edge of Lisa's bed now, who was passed out at this point, and let Lily stand on her thighs. Supporting under her arms with her hands Lucy brought Lily into a kiss, placing her lips on her cute sister's small mouth. Lily was used to getting pecks on lips from her family members but this kiss lasted a lot longer and was a whole lot wetter. Lily cooed in her sisters mouth as Lucy plunged her tounge deeper enjoying her sister's lack of resistance. Lily's innocent mind believed this was some kind of game and placed her small hands on Lucy's face surprisingly kissing back. Lucy giggled in amusement and stripped Lily of her onesie letting it fall to the floor underneath them. Lily shivered and cooed as Lucy stuck a finger in her underdeveloped pussy. Her cute face blushed embarrassedly and she made the most adorable sounds as Lucy worked her other finger in. Lucy despite having ravaged Lisa earlier was gentle with her baby sister, pushing in and out her tiny pussy as it gripped tightly to her fingers. Her cock was becoming frustrated however spewing gobs of precum the more she teased Lily,
"Lets try something else now Lily does that sound fun...?~" Lucy licked her lips positing Lily to stand over her cock. Lily giggled as Lucy tickled the opening of her pussy with the tip of her cock. Lucy's cock was was seeping precum as she enjoyed the sensation of Lily's smooth baby puss. She pushed down on Lily's waist ever so slowly, the tip of her cock slipped inside her baby sister with a wet pop now. Lily's eyes widened and she cooed as her cheeks turned red Lucy's tip was much bigger then her fingers. Lucy moaned herself Lily was extremely tight but this slow pace was agonizing for her cock. Lucy pushed Lily down even further daringly stuffing the toddler with even more of her cock. Surprisingly Lily showed no signs of discomfort if anything Lucy could swear she was enjoying this. Lily made the cutest moan as Lucy pushed her all the way down to her base, completely hilting her cock into her pussy and past her womb. Lucy's cock bulged her stomach,
"H-Holy fuck, good girl Lily let's t-try moving now mmm~" Lucy moaned awestruck her baby sister was taking her cock like a champ,
"Horrie ffffuk" Lily mimicked Lucy giggling whilst rubbing the bludge in her stomach Lucy's cock made. Lucy bit her lip as she churned her cock in and out of Lily's pussy awkwardly, Lily drooled breathing heavily her face red with delight. Lucy started to bounce Lily in her lap now her walls gripped her tighter with each thrust causing her to drool herself. Lily's small hands made fists as Lucy's cock stretched and burrowed deep in her womb moaning softer then Lucy. Lucy stood up now and started using her baby sister like a flesh light. Holding on to Lily's sides she thrusted faster enjoying how tightly her entire member was being squeezed,
"H-Here it comes Lily, big s-sister is going to give you lots of goo mmpf!~" Lucy moaned throwing her head back. Lily's little feet kicked and she cooed as Lucy's hot cream over stuffed her tiny womb. Lucy pulled out and coated her baby sister with the rest of her cum giggling satisfied,
"Goo g-goooo" Lily mimicked with her stomach bloated liked Lisa's. Lucy set her back in her crib and slumped over with a drunken smile. As Lily drifted back to sleep Lucy underwent another change. The hair around her ears parted slightly as two horns protruded from her head. Instead of dressing herself this time she grabbed her tome and floated a few inches off the floor leaving her youngest sister's room.