How Using My Oppai Skill to Enlarge My Sister’s Breasts Led to Building a Harem - Chapter 7
Chapter 7
I became Yukino’s school-only boyfriend. Since our seats are right next to each other in class, we’re always together.
“What do you do on weekends?”
“Hmm, hang out with my sister, visit my girlfriend’s place… and sometimes do massages at a shop…”
By massages, I mean breast massages. My work at Mizuki-san’s shop was well-received, so I still do it regularly as a hobby.
“You’re good at massages… a part-time job?”
“Nah… more like volunteering.”
“Really? That’s impressive.”
“Uh, not really.”
I get to fondle all kinds of oppai, and the ladies feel better about their breasts. It’s a win-win, right?
“Can I tag along next time?”
“Huh!? That’s… kinda…”
“No big deal. If it’s volunteering, I want to help too.”
Yukino’s serious class-rep nature kicked in, her desire to contribute to society in full force. Overwhelmed by her enthusiasm, I couldn’t refuse, so I agreed to take her to the escort agency on the next day off.
※
“This is where you volunteer…?”
“Y-Yeah… that’s right.”
“It’s… very unique, isn’t it?”
It’s a high-class place, but still an escort agency—definitely a distinctive vibe. As usual, I entered through the back and started working on the ladies after their shifts.
“Hey, sensei! My shoulder stiffness is gone thanks to you. Thank you♡”
“Customers complimented how beautiful my breasts are now, all thanks to you, sensei.”
“I want mine a bit bigger~”
One after another, gorgeous women came to the simple examination table in an empty room, and I massaged their oppai. Yukino, watching from behind, froze in shock.
“T-This is volunteering…? You’re just rubbing their breasts…”
“Oh, sensei’s amazing. He’s fixed all our physical issues.”
Night work is physically demanding, and everyone has their struggles. I love oppai, but more than that, I want all women to be healthy and beautiful. Seeing their breasts become more beautiful is my greatest joy.
“I-I see… that’s one way to look at it. They do seem happy.”
No woman doesn’t love feeling prettier. Everyone I massage ends up smiling. Wanting to make more people happy, I worked even harder at it.
But while massaging one woman’s breasts, I felt something off.
(What’s this… a lump?)
“Something wrong, sensei…?”
“No, just a slight irregularity on the side of your breast…”
“Huh… you mean?”
Focusing my finger nerves, I kneaded carefully, guniguni, to check inside.
“It’s probably a benign tumor.”
I’m no doctor, just going by touch, but I was certain it wasn’t harmful.
“I-If you say so, sensei, maybe it is.”
“Just to be safe, please get it checked at a hospital.”
“Got it…”
The serious exchange created tension, but it likely wasn’t a big deal. Glancing back, I saw Yukino with a stiff expression, which puzzled me.
“What’s up?”
“Oh, um… you looked so cool, like a doctor.”
“Haha, can’t do medical stuff without a license.”
It’s just massage—my hands are just a bit special. But Yukino seemed to see me in a new light, occasionally looking at me with admiration.
※
“Ah, ah… ahn♡ So good, pound my pussy harder with your cock♡”
During lunch break, I was in the old library storage room, enjoying sex with Yukino again.
Paan♡ Paan♡ Paan♡ Paan♡
“Ohh♡ So good! I’m gonna come… ahh, coming, coming~~~♡♡♡”
“Haa…♪ It’s coming… your cum in my pussy feels so good♡”
Yukino’s hooked on creampie sex, demanding I finish inside every time. I’m just as addicted to seeing the usually serious girl go wild on my cock, unable to stop.
“Yukino… njuu… chu…”
“Nhaa♡… churu, so happy♡”
Each time we have sex, our emotional bond grows.
(It’s not serious… my real girlfriend is Satsuki-chan.)
I try to convince myself it’s just physical, but it’s a fragile, distorted relationship that could collapse anytime.
※
Since then, I’ve done massages at the shop several times, and Yukino’s tagged along each time—it’s become routine.
“Yup, the lump’s gone.”
“Thank you, sensei. The hospital said it’s benign, no surgery needed, but…”
“It could affect your work, right?”
If a lump’s left, clients might notice. But surgery leaves scars for a while. She asked if I could reduce it with massage.
“I never thought it’d disappear so cleanly…”
“Glad it worked out. We can’t let such beautiful breasts get scarred.”
“Fufu, thank you, sensei. Chu♪”
The woman I helped gave me a kiss—a light one on the lips, but filled with gratitude, the best reward.
But Yukino, watching, had a complicated expression.
“You look so happy…”
“Yeah, helping people feels great.”
“Oh, right. Sorry…”
Why’s she apologizing again?
…
Since then, Yukino and I grew even closer.
She started seeking out empty school spots to beg for sex.
“No one’s here now.”
“Yukino, this is a bit risky, isn’t it?”
“Says the guy whose friend is ready♪”
We were in an empty changing room. She dragged me here for sex. I tried to stop her, but my cock, fully erect, ignored me in front of a horny girl.
“Yukino…!”
“Kyan♪ Fufu, let’s finish before anyone comes♡”
…
Paan♡ Paan♡ Paan♡ Paan♡
“Aahh! That’s hitting so deep…♡”
“Ugh, Yukino… your pussy’s so tight!”
“Oh! Oh! Ohh…♡ That’s too good♡”
Yukino let out vulgar moans only I hear, tightening her pussy, kyun♡. Her amazing pussy drove me to thrust wildly, overwhelmed by pleasure.
“Nhaa♡ Your cock’s amazing, I’m coming! Coming, coming~~~♡♡♡”
Pampan! Pampampan♡ Dochun♡
“Haaa… it’s coming♡ Pulsing inside…♪”
Yukino loves creampies, and with me, it’s always deep inside.
“Your panties are gonna get dirty…”
“I brought plenty of spares, so it’s fine♪”
She keeps spares in a sealed bag. I worry about the cum smell giving us away, but Yukino—
“It doesn’t feel like sex unless you finish inside.”
—she won’t budge.
It feels amazing to cum inside, but I worry she’s becoming a sex addict.
That’s how our days went. But one day, Yukino brought up a tough challenge.
…
“Treat someone with breast cancer?”
“Yeah, my relative… she needs a mastectomy…”
The word “mastectomy” shocked me. How could such a divine feature be removed? It’s medical necessity—cancer’s serious—but thinking of her feelings…
“She’s really down… understandably. I couldn’t handle losing my breasts either.”
“I… want to help somehow.”
“Can you…?”
“I don’t know… I’d have to try.”
Could I do what modern medicine can’t? Honestly, I don’t know. Shrinking a benign tumor isn’t the same as curing a malignant one.
“I believe you can. Your hands are a gift from God.”
“From God…?”
“Yes, so be confident.”
“…Okay.”
I took on the challenge. I don’t know if my hands are divine, but if a woman’s struggling with her breasts, it feels like my mission to help.
…
The next day, I went with the woman I’d treated for a lump to an empty room above a stylish bar, once the area’s only clinic, now unused since the elderly doctor retired.
“Can’t bring her friend to the escort agency.”
“This place works for regular people.”
A woman visiting an escort agency for treatment could raise suspicions. The woman negotiated with the bar’s owner to borrow it.
“Electricity, water, gas all work, right?”
“Yes. I don’t need special equipment.”
The room had chairs, a table, and two leather examination tables—simple but functional.
“Please take care of her, sensei. I was scared when I had my tumor… please help her.”
“Of course. I’ll do my best.”
And so, I got my own (unlicensed) clinic.
…
The next day, I waited alone in my signless clinic for the patient. The issue was too private, so I asked Yukino to stay away.
(I hope my hands can help…)
I stared at my hands, thinking.
Knock knock
“Come in.”
“Excuse me.”
A stunningly beautiful woman entered—raven-black hair, refined features, perfect for a traditional Japanese beauty. And her massive breasts, tiny waist, and huge hips?
(I’ve seen all kinds of beauties, but she’s top-tier…)
Her beauty almost sparked impure thoughts, but this was treatment.
“Please fill out this form first.”
“Yes.”
I’m no doctor, but I borrow good ideas. I made a form for patients to fill out thoughtfully.
“Done, sensei.”
“Thank you.”
(Hmm, Saionji Ayaka, 26, married, no kids.)
“When did you notice symptoms?”
“About a month ago. I felt something odd in my breast, like a lump…”
“And the hospital diagnosed it?”
“Yes. A malignant tumor… they said a mastectomy is the only option… sob…”
Her beautiful face contorted in pain, tears streaming.
“I understand… I’ll do my absolute best.”
“Please… I can’t bear losing my breast. You’re my only hope…”
“Okay. First, please take a shower. It’s over there.”
She needed to relax first. Since the agency women showered before treatment, it’s become my method. I showed her the shower and towels, then prepared alone.
“Aroma oil for relaxation…”
A gift from one of the agency women, steam-powered, perfect with a plug. The woman-friendly scent was a nice touch.
“Heater’s okay…”
It’s September, not too cold. As I finished, Saionji-san emerged from the shower.
But I’d made a mistake.
“Um, sorry, the towel’s a bit small…”
“Ah… s-sorry!”
I assumed she’d dress after, so I didn’t prepare a large towel. But Yukino must’ve told her about the treatment, so she came out wrapped like the agency women.
“N-No… fufu, Yukino-chan said you’re an amazing sensei, but you’ve got some age-appropriate quirks, huh?”
Forgetting her earlier despair, Saionji-san giggled elegantly. Her goddess-like beauty and refined laugh nearly melted my brain.
“Haha, but if you’re relaxed, that’s good. Stress is bad for the body.”
“True. Fufu.”
“Please sit here.”
Since she was already undressed, I proceeded. With a cute “yoisho,” she sat on the exam table’s edge. I tried not to stare at exposed parts.
(What a gorgeous body… and to cut off her breasts…?)
Unthinkable. It can’t happen. I renewed my resolve to save her.
“I’ll check the affected area.”
“Y-Yes, please, sensei.”
I lifted her massive breasts from below, gauging their weight. Like melons, their heaviness was beautiful but likely strained her body.
Yusa♡ Yusa♡ I balanced their weight.
“Nn, ah… nnu…!”
“Hm, the left’s a bit heavier. Is that the affected side?”
“Ahn… y-yes.”
“Got it, I’ll continue.”
Breast issues often show in weight differences; advanced cases deform the shape. I kneaded her breast, munimuni, checking lower areas—fine. Then I squeezed from the side, gunyu, and jiggled it. Her large areolas and nipples traced pink arcs.
“Nnn… ah, ah, nn!”
“Uniform jiggling. No issues here.”
Different firmness changes jiggling. This wasn’t the spot.
“I’ll check the upper part.”
I slid my fingers into her cleavage from above, grasping the breast flesh, guniguni, searching inside.
“Found it. A tumor in the upper outer left.”
“T-That’s right…”
“I checked the whole breast; no spread elsewhere. If we treat this, you won’t need surgery.”
“Please, sensei… please save me from losing it!”
She bowed deeply, tears falling, pleading.
(A man who can’t step up after this isn’t a man…)
“Got it. I’ll take down this nasty tumor that’s making a woman cry.”
“Oh, fufu… thank you, sensei.”
My playful tone made her smile like a blooming flower.
Her radiant smile left me utterly captivated.
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