Chapter 1 — Senpai and Intimate Sex

I was David Kang’s older senior colleague, and not just by a little—there was a significant age gap between us.

Yet his skill in handling my body was so masterful that only today did I realize the limits of my own restraint when it came to suppressing moans of pleasure.

A young bachelor’s studio apartment felt like a long-forgotten place to me. Modern as it was, “studio apartment” still suited it better than “studio.”

It wasn’t much different from the room where I’d first been intimate with my husband—laundry piled in a corner, the sink full of unwashed dishes.

Eight years ago, I’d believed I’d matured sexually to a certain degree, but that was a delusion.

After finishing the second round of drinks at the sales department’s after-work party, I accepted his casual invitation to “come by my place nearby for coffee.” I knew, at least vaguely, what lay beneath that offer—but since I’d walked in willingly, this wasn’t rape.

Still, the way he hastily stripped me of my clothes the moment we stepped into the apartment was almost like assault. No coffee, not even a glass of water—he lunged at me the second the door closed.

The bra and panties I’d worn that day would never be worn again.

After a brief struggle and token resistance, I lay on his single-person bed, legs spread wide, ready to receive him. In that moment, I trembled—not from fear, but from resolve and anticipation coursing through my body.

Before entering me, he rubbed the head of his cock against my wet entrance dozens of times. From the missionary position, I lifted my head slightly to look down—and couldn’t suppress my shock.

Compared to my husband’s, David Kang’s was more than double in size. Length aside, it was the thickness that terrified me. When he finally pushed in, I shut my eyes tight and clenched my teeth.

Yet the pain was surprisingly mild. He clearly knew what he was doing, gently guiding himself all the way in with careful consideration. His slowness made me impatient—so much so that I lifted my hips and rocked my waist toward him.

The sensation of a thick rod entering my body was indescribable. Once the back-and-forth motion began, I forgot all shame and actively cooperated with him. There was no way I could maintain composure.

Any plan to handle him with the grace of an older, mature woman vanished completely. My intention to simply give a younger, single employee a sweet night had devolved into the raw, lustful behavior of an aroused married woman.

I wrapped my long legs—legs I myself found beautiful every time I put on stockings—around him. I sharply raised my hips, matching the rhythm of his thrusts. I crossed my ankles into a knot, my slender arms circling David Kang’s neck.

I enveloped him with all four limbs. Then we kissed—not sweetly, but hungrily, like starved animals. It was the kind of kiss I’d only shared with my husband in the earliest days of our relationship, a kind we hadn’t exchanged in years.

“Uhh, Sarah senior colleague… You’re responding so well. So damn good.”

His praise made me flustered and embarrassed. Instantly, we knew we were physically compatible. The age gap, though noticeable, felt trivial in today’s world.

David Kang’s movements gradually grew stronger. Each deep or shallow thrust drove me mad.

Even when my husband would’ve already collapsed, David Kang remained effortlessly composed. With my legs draped over his shoulders, he rowed steadily—looking incredibly dependable. Then he claimed one breast in each hand.

When he rubbed my erect nipple with his thumb, I finally spoke words I never thought I’d say. It was a kind of confession.

“Ahhhh… Yes, I’ve had my eye on you, David Kang. Did you know? I’m happy… I love that you’re making me feel this way. Ah—no, don’t stop! There—touch me there more.”

My breasts, more sensitive than ever, responded fiercely to his hands. My 38-inch bust, somewhat large, felt like something to be proud of today—especially since he clearly liked big breasts.

My husband, though he never said so, wasn’t fond of large breasts. Unlike others, he preferred women who looked like girls—small-chested, unassuming. The complete opposite of me.

At times, I’d wonder why he married me at all.

Tall (168cm), with 38-inch hips and chest, I simply wasn’t his type.

Only after marriage did I truly understand his character.

I know about the relationship he has with Miss Kang, the secretary he keeps close.

I’d sensed something suspicious over the past year.

Our marital intimacy had been nonexistent. Perhaps that was why I’d so easily succumbed to David Kang’s temptation and ended up in this illicit affair.

In Sales Team 2, with seven employees total, five were men handling fieldwork, while two women assisted with paperwork.

Under the perennial section chief was one senior manager, and among the three male staff of varying experience, David Kang, at 25, was the youngest. Handsome, well-educated, and effortlessly charismatic, he was a “king” even admired by female employees from other departments.

Though his achievements were still modest, his future was bright.

“Haha. Sarah senior colleague, let’s switch positions. C’mon, get on top. I’ll just lie here. Show me what you’ve got—really let loose. I like energetic women.”

I straddled him, initially unsure what to do. Looking down at David Kang, I saw him smirking, clearly anticipating the technique an older woman might display.

I interlaced both hands behind my head and crouched slightly, gently lifting and lowering my hips.

The sensation was entirely different. With my husband, we’d fallen into routine, indifferent to small details. But with David Kang, I observed every little thing.

I placed my hands on his chest, leaned in for a kiss, and moved my hips with passion.

The low growl from his clenched mouth told me he was thoroughly satisfied. He grabbed my hips tightly with both hands.

His strong grip felt like he was trying to split me in half. His cock, stirring inside me, quickened its pace, and I matched it with eager thrusts. The bed creaked incessantly.

“I love you, David Kang… Ahhh! This is the first time I’ve ever gone crazy like this. You can cum inside—please, don’t stop! Fuuuuuh… So good, so good…”

“Uuuhh, Sarah senior colleague, just a little more of that hip… Uuuuuh—here I go. One… two… thr—eeeeee—Ahhhh!”

The climax lifted me toward the sky. I collapsed into his arms. Tears of joy blurred his face. But some of my tears were mixed with fear and guilt.

They didn’t stop easily. I sobbed quietly, then fell asleep in David Kang’s embrace. I was grateful he didn’t try to comfort me—his silence meant more.

Even if time could rewind, this was bound to happen soon.

Besides, David Kang bore an uncanny resemblance to my first love—someone I’d buried deep in the past. A love unspoken, never kissed, never acknowledged.

When I woke, I was still tightly held in his arms. Not much time had passed. I lifted my head slightly—he was looking down at me.

“You’re awake, Sarah senior colleague? You slept so cutely, like a baby.”

His bright smile made me return a cheerful look. He was a good man—definitely not the type to pressure me later about this affair.

Even if curiosity about older women had driven his seduction, I didn’t want to blame him.

“Were you disappointed? I was the only one getting excited, it felt like. Wait—what’s this?”

The last question was unnecessary. His re-erected cock pressed firmly against my lower abdomen, demanding another round. I blushed anew as I reached down and touched it.

I never expected holding another man’s hard, thick cock to feel so embarrassing—especially since I’d never touched one besides my husband’s.

Lying awkwardly to the side, I sat up. As I explored his form with both hands, I found myself increasingly drawn to his shape.

Unlike my husband, he hadn’t been circumcised. When I pulled the foreskin taut, the glans disappeared beneath it.

I played with this new toy persistently until I felt his hands on my breasts again, moving slowly from side to side, flicking my nipples.

It was an electrifying caress that rapidly spread through my entire body—utterly different from my husband’s indifferent touch. He occasionally squeezed my large, firm breasts hard.

“Could you… do it with your mouth? Only if you want to.”

“I want to taste it… Is that okay?”

We spoke at the same time, then burst into laughter upon hearing each other. My bold suggestion had been nerve-wracking, but after laughing, my tension eased, and courage surged. Slowly, I lowered my head toward him.

At first, I didn’t take it into my mouth—just extended my tongue and licked the surface. There was still some residue from earlier, which made me hesitate, but I quickly realized it wasn’t unpleasant.

I moved even slower, taking his testicles into my hand, supporting and licking them. I rolled the pair around, running my tongue along the inner groin.

He sat up slightly, watching me serve him between his legs. Occasionally, he reached out to brush aside my bangs blocking his view.

One of my hands never left his shaft. Sometimes, I used both hands to stroke him. Finally, I opened my mouth and took him in—I felt utterly happy.

The pain of him hitting the back of my throat made me pause briefly, but I quickly resumed, moving my head rapidly. David Kang gasped for breath and trembled all over.

As I grew more confident, I sucked and swallowed more skillfully, wrapping my tongue around the object in my mouth. Naturally, my lower half grew wet again, slick and ready.

I had no choice but to slide one hand down to soothe myself. I warmed the area with my palm, urgently caressing it, spreading and touching each petal of my outer and inner lips.

I was rapidly becoming aroused.

He quickly noticed and laid me down. Holding his cock—glistening with my saliva—he approached my soaked entrance and began rubbing the head against my clit.

As he touched my clitoris, I opened myself with both thumbs. I couldn’t bring myself to look at his face, so I turned my head to the side and whispered.

“Put it in—now. I can’t hold back anymore. Uhhnn… Ahhh!”

Unlike the first time, he thrust in all the way to the root at once. He leaned down and kissed me—this time, a soft kiss where our tongues deeply intertwined.

Our lower bodies stayed tightly pressed, circling endlessly. He was slightly heavy, but I lifted my hips to meet his desire.

Again, I raised my legs high, then wrapped them around his waist. The movements were slow, but the pleasure surpassed imagination—I had to bite his shoulder to keep from screaming too loudly.

Scratch marks from my nails multiplied down David Kang’s back. Only when my vision blurred completely did I beg him to rest.

I hadn’t moved much, yet my body collapsed. The reason? I’d poured every ounce of strength into clinging to him.

Later, we repeated a similar process, climaxing together—but I was too ashamed to face him. At the end, I asked him to cum in my mouth.

I desperately wanted to taste him. He readily agreed, pulling out at the last moment and thrusting his cock into my mouth. With one hand, he reached between my trembling thighs.

Of course, a few fingers began moving rapidly inside me. Soon, I tasted the thick liquid exploding from him. After that, I slowly tasted each of his fingers, soaked in my own arousal.

I declined his offer to wash up, instead putting on my ruined underwear like rags and returning home. Fortunately, my husband hadn’t returned yet. I filled the tub with hot water and washed my body.

During the long bath, my hand often slipped between my thighs, tracing David Kang’s traces.

Even though I’d see him tomorrow, the wait felt unbearable. We hadn’t made any promises.

Yet I had a strong premonition—he would seek me out again. Soon.

I stuffed my ruined underwear into a trash bag where my husband wouldn’t see.

Then I put on new lingerie—something particularly daring I’d picked out in advance.

From now on, I wouldn’t wear cheap underwear to the office.

Because I didn’t know when the next chance would come.