Bad Ending: D-Class Lewd Partner Drone Sonia 4
“Please… Luce…♡”
Sonia’s white-latex finger glided toward the sensitive tip of her soft, perky breasts where the two nipples met.
It kneaded the spot with deliberate softness, as if trying to soften it even further. Yet the more it was touched, the harder the two nipples stiffened, becoming lewd switches that refused to leave Luce’s inverted nipples.
“Ah… I understand, Sonia! Sonia is asking me to… so I’m doing it because she asked…♡”
When Sonia gently stroked the areola of Luce’s pierced inverted nipple, a faint electric tingle spread through Luce’s entire soft, perky breasts.
The sweet current flowed smoothly over the latex finger, making Luce’s body tremble.
“…♡ Master… You like having your breasts touched…♡ Pervert… I’ll touch you plenty later… Right now, set this lewd drone Sonia to your exact taste… ? Right now I’m not your Sonia robot… but a stupid pervert drone that obeys the second anyone pulls on my nipples…♡ So let’s begin! Please stay still, Luce! …Sonia from now on, please take care of me…♡”
“Stupid… pervert… drone… Sonia…♡ Stay… stay still… heuk…? Ah… ahah… ah?! Don’t… don’t pull… Sonia…♡ Sonia…! Hup…♡♡ Heu…♡”
As soon as the words left her, Sonia firmly pinned Luce onto the bed.
She slowly pulled her body backward, trying to extract her own erect nipple from the depths of Luce’s inverted nipple.
Luce’s inverted nipple, already rock-hard from the lewd caresses, clung to Sonia’s nipple tip like sticky honey and refused to let go.
Perfectly molded to Sonia’s nipple shape, Luce’s lewd inverted nipple breast had swollen inside the lewd drone’s switch, making it even harder to pull free.
“Uu…♡ Luce… Master…♡”
“Sonia… that… that… uuu. Ahit.♡ When you pull on the breasts… it hurts…♡”
Crack… Crack…
The erect nipple coated in shiny latex tried to escape from Luce’s lewd nipple.
Like a perfect key and lock that had once entered and both had orgasmed together, the lewd breasts of the two women refused to release. Luce’s inverted nipple bit down proudly on Sonia’s retreating nipple and refused to let go until the end.
“Th… stay like that… Luce…♡… Luce… Master…♡”
Luce’s inverted nipple remained sealed around Sonia’s nipple. Nevertheless, Sonia kept pulling back.
The lewd drone Sonia, whose nipple was being tugged by force, began changing into programming mode the moment it was pulled.
“Ah… ahah…♡ This is it… this… this feeling… s… start? Let’s start, Luce… programming mode… please take care? …Ah… ah… ah…♡… A little more… Luce… grab with your inverted nipple… co… a little more…♡”
…♥
Finally, the nipple coated in smooth latex slipped free from Luce’s lewd soft inverted nipple with a soft pop.
It was not a simple sound. Along with the lewd pain as if flesh were tearing away came a strange sense of liberation. The empty inverted nipple still carried the lingering warmth of Sonia’s body heat and the slick touch of latex.
“Hwaang…♡ …Sonia… what is this…♡ I never imagined… pervert…”
Puff… puff…
Because of the lewd drone’s nipple that had come and gone on its own, Luce’s inverted nipple now stood rock-hard, ready to rise.
The place that had once been shyly hidden was now being kissed by the intruder’s latex-covered tip and being toyed with.
(…This… I can’t let Sonia do this to me…♡ If I feel this, I won’t be able to see her as a friend anymore…♡)
The panties were already soaked. For a moment the D-class adventurer wondered how she should look at her close neighbor friend. The erect nipple pulled taut by the lewd nipple that had finally come free from Luce’s inverted nipple.
Although it slipped out with a cool sound, the act had already triggered the lewd drone Sonia’s switch.
“…Drone switch input confirmed… Drone Sonia will enter programming mode from now on.”
Wearing the association-issued hero bodysuit that clung tightly to her body without a bra, the erect nipples stood proudly on the white latex.
Her eyes glowing bright green, she stared blankly at the ceiling, looking more and more like the Sonia robot Luce had imagined.
“Sonia!? This… this is the programming mode Sonia was talking about… You’re really a pervert… pervert…♡ If I do this… I have no choice but to keep going…♡ I’ll do it…! This… for now, that’s it… that… the way to activate the Sonia robot… and management mode… uu…♡”
'Since anyone pulling on the nipples will enter programming mode, please change the pattern by inserting the lewd drone’s switch into Luce’s inverted nipple!'
It was possible to trigger programming mode by pulling the nipple in a special joystick-like way, but she had already asked to change the condition by accepting the lewd drone’s switch with Luce’s soft inverted breasts… Now all authority rested in Luce’s hands.
Sonia—no, Drone Sonia—left only the erect nipples sharply protruding on the bodysuit and began repeating the same words like a robot waiting for commands.
If Luce did nothing and left her alone all day, she might lie motionless in this soundless space, exposing her lewd erect nipples pointlessly.
“…You’re crazy… really… crazy… Sonia…♡”
Luce slowly reached out as if hypnotized.
She pressed her palm firmly against the sensual surface of the white latex bodysuit where the upper breasts were exposed, feeling the soft inverted nipple beneath.
It was a strange sensation—smooth and cold on the surface, yet warm body heat underneath.
Sway… sway…!
“Uu… uuu… really soft… The bodysuit is smooth… I want one too… This… this is Sonia’s breast… switch…♡”
“…Drone Sonia is entering programming mode from now on. …Drone Sonia is in programming mode standby…”
Like someone seeing a woman’s breasts for the first time, Luce gazed at Sonia’s breasts with pure curiosity mixed with budding desire.
Luce gently rubbed the breasts, then playfully pinched them with her fingers.
She had seen many times in dungeons the jiggling breasts of a broken-armor ally, or women with far larger breasts than her own at hot springs, but the feeling now was entirely different.
Luce was no longer just a D-class adventurer.
The soft inverted nipple Luce who had directly experienced the service of the lewd drone Sonia and become her master and creator. She began, little by little, to open her heart to this depraved situation.
In fact, considering the casual use of succubus salons in this world’s culture, this might be considered rather tame.
The Sonia with green eyes repeating the same words “Command in progress, master” was left untouched. Luce focused instead on the nipples and surrounding soft flesh covered by the bodysuit, which still asserted itself defiantly.
Luce gathered Sonia’s breasts in both hands and pulled them.
(Th… really… soft… Sonia…)
Swaying… swaying… the E-cup breasts jiggled like toys in Luce’s hands, yet thanks to their elasticity and the bodysuit’s glossy smoothness, they always snapped back to their perfect shape.
Just watching Sonia’s breasts being pulled this way and returned to place, Luce’s inverted nipples trembled.
Luce leaned her upper body, placing her thighs between Sonia’s.
She slowly wetted Sonia’s thighs with her own bodily fluids, then finally gathered her resolve, grabbed the breasts and white bodysuit, and brought her mouth close.
As Sonia had wanted, covering the lewd erect switch with the inverted nipple… well, she had to, but Luce was an impulsive adventurer whose mouth acted first.
(Lub… lube! This is just to make it slippery… a preparation process… not pervert… not… uu…♡)
She took the lewd nipple—now even larger and harder than usual—still covered in the latex bodysuit, into her mouth.
While sucking the stiff nipple and gently stroking the underside of her tongue, she became the master of the lewd drone.
Although she was not as thoroughly conditioned as Sonia, who felt everything sweetly, when she began to slurp the erect nipple protruding on the smooth latex bodysuit, it felt gripping and strangely comforting, like a breast pump.
“Please proceed with the programming procedure.”
Slurp… slurp…♡
While sucking the calming nipple… the lewd switch smooth like a breast pump, Luce naturally pulled Sonia into a hug from the side as if she were a pillow.
“Programming procedure… uu… please proceed…♥”
“Re… really like a robot… Sonia…♡”
Even as Luce sucked Sonia’s lewd switch slurpily like a baby, Drone Sonia continued to repeat the same words without reaction.
Her eyes only gazed into space, glowing green. By changing the master registration procedure in programming mode to something only Luce could do, it was possible to turn this lewd drone into a perfect Sonia robot belonging only to her at any time.
-Spider legs…? Interesting. So what happened to those academy students?
-Since Luce didn’t get hurt, it’s fine, right? You did the right thing, Luce! Come here, I’ll pat your head!
-Eh… dungeons are troublesome…
Programming mode. Please proceed with the programming procedure.
“S… Sonia…♡ Sonia robot… is mine… hweu…♡”
(Oh… yesterday… if I hadn’t brought only the spider legs… I wouldn’t have ended up like this…♡ That… that Sonia… changed into… like this strange robot… pervert, Sonia… Sonia is also pervert… and I am pervert too…♡)
In Luce’s mind, the image of Sonia the lazy but somewhat cautious D-class hero of Sky City overlapped with the robot Sonia repeating the same words and standing erect nipples in front of her.

Not Sonia, but humanoid. Not Sonia, but drone. Therefore, Sonia robot.
The thought that this lewd robot would soon belong to her alone, the secret action only she knew, becoming a master in a way no one could imagine by accepting the lewd erect nipple with the inverted nipple, made Luce’s body tremble with excitement and shame.