I Fucked My Mother-in-Law to Marry My Girlfriend

"Is my mother-in-law completely out of her mind?!"

I had been holding back until now, but no matter how much I thought about it, my mother-in-law's actions were far from normal. Even if she had been trained as a masochistic slave by her husband in the past, was it really acceptable for her to seduce her son-in-law and attempt to pleasure him right outside her daughter's room? Even without understanding the world of the wealthy, I knew this was beyond abnormal.

Throb, throb.

"This guy's gone crazy too…"

Despite my rational thoughts, my body betrayed me. My dick throbbed as if it had no intention of resisting my mother-in-law's advances.

"M-Mother-in-law… even so, here…?"

I nervously glanced to the side. We were standing right outside Yeonji's room. If we made even the slightest noise, she could step out at any moment. This was an incredibly risky situation—one where no excuse or explanation would suffice if we were caught. Yet, there she was, my mother-in-law, casually seducing me, flaunting her sheer panties without a care in the world.

"It's fine, honey♥. The assignment will take at least another hour. If you hurry and make a 'brrrrt brrrrt' in my pussy, we'll be done in no time♥."

She formed a circle with her thumb and index finger, mimicking the motion of gripping and stroking a dick, while simultaneously making a sucking gesture. Her gaze was fixed on my crotch, making it feel as though she was already pleasuring me.

'I should refuse… not here… ugh!!'

I had already crossed several lines with my mother-in-law, but the location made this situation even more conflicting. I wanted to reject her immediately, but after intentionally stopping her earlier handjob, I was now pent up. Knowing how good her pussy felt only added to my internal struggle.

"The doors in our house are thick, so no one will hear us even if we're this close♥. As long as you don't scream, you can cum in your master's private toilet right here♥."

My lewd mother-in-law continued her seduction. She opened her mouth wide, sticking out her tongue and swirling it around, as if to demonstrate how skilled she was.

'I need to hold back…'

Swoosh.

"Aah♥"

My mind screamed at me to refuse, but my body had already taken a step forward, bringing me face-to-face with her.

Swoosh… jiggle.

My mother-in-law revealed her breasts again, which she had been concealing, and flashed me a lewd smile. She looked at the sizable bulge in my pants with approval and took it into her mouth.

"Hmm♥ Woop♥ Sluurp♥ Woop♥"

"Ugh!…. Ah..."

The way she pleasured me with her tongue made me regret holding back earlier. It felt too good to resist.

"To have a man with such a big, delicious dick… Yeonji is so lucky♥."

She glanced toward Yeonji's room, a sly smile playing on her lips. While I felt a pang of guilt for Yeonji, the overwhelming sense of depravity kept me from stopping my mother-in-law.

"Here, these are my breasts—bigger than Yeonji's… Do you like them?♥"

"Y-Yes, I do… ugh….."

She grabbed her ample breasts, something Yeonji, being shy, would never do. But for my mother-in-law, who was striving to please her master, it came naturally.

"Has Yeonji ever used her breasts like this?"

"O-Once…"

I answered honestly without thinking, and my mother-in-law frowned, as if pitying me.

"Haa… Poor master… Woop♥ Sluurp♥ Heup♥ Woop♥"

She continued sucking my dick, her tongue swirling around it as if to comfort me. Unlike before, she wasn't taking it deep into her throat, focusing instead on stimulating the tip. It felt good, but it also left me wanting more.

"To have such big breasts and not use them properly… I guess she really didn't get enough sex education… Woop♥ Sluurp♥"

'What kind of parent teaches their child how to give a breastjob?!'

I wanted to say that, but honestly, I had often fantasized about Yeonji doing just that.

"As her mother, I'll make it up to you with a sincere heart♥."

"M-Mother-in-law?!"

Squeeze.

"Ugh!!"

She wrapped my dick with her large breasts. Even among adult film actresses, few could boast breasts of this size. Not only that, but she also had a plump butt and a slender waist—a combination of genes that seemed almost too perfect. Both my mother-in-law and Yeonji shared these blessed genes, and now my mother-in-law was using hers to serve me.

"If I just rub it, it'll hurt… Behh♥"

She gathered saliva in her mouth and spat it onto her breasts. Surprisingly, it didn't feel dirty at all. Instead, I found myself wanting to smear her sticky saliva all over my dick.

"As expected, your dick is so big that it's a little lacking♥… Can you spit on me?♥"

"Huh!? W-What do you mean?"

Squeeeeze.

"Here, please bestow your saliva, master♥… Behh♥"

"Ugh!!"

She shamelessly pressed my dick between her breasts, urging me to spit on her. Her masochistic tendencies were on full display, and while I had lived a relatively normal sex life until now, this was entirely new territory for me. The fact that she was my mother-in-law made it even more surreal.

"Here♥ Please spit here♥ So I can wrap your master's dick tightly with my wet pussy♥."

When I hesitated, she pressed her breasts together and begged me again. She waited with her mouth wide open, eagerly anticipating my saliva.

'I… I don't know anymore!!'

Time was running out, and staying in front of Yeonji's room was too dangerous. Finally, I made up my mind and gathered saliva in my mouth…

"Ptooey!"

"Heeeuuuuung♥"

I spat into her mouth. It was my first time doing something like this, so my aim was off, and some of it landed beside her mouth. But she trembled with delight, licking up every drop.

"Munch munch munch… Behh♥ Thank you for spitting on me, master♥."

She mixed my saliva with hers and applied it to my dick. The lewdness of the scene made my dick throb and leak precum.

"Then, I'll start serving you♥… Haa♥….. Haang♥….. Hiss♥."

She coated the inside of her breasts with saliva and began shaking them with her hands.

"Ugh!?… Ugh!… Haa… Ugh!"

The sensation was unlike anything I had experienced before—like my dick was being enveloped in a soft, warm water balloon. It felt infinitely better than when Yeonji had tried it.

Thwack thwack thwack thwack thwack.

"Hehe♥ It seems like you're enjoying it too, master♥. It's writhing inside my breasts♥."

Only the tip of my dick was exposed, while the rest was buried in her breasts. The faint heartbeat I could feel through her chest only heightened my excitement.

"Here, for the part that's lacking with my breasts… Heup♥."

"E-Even my mouth! Ugh!!"

Now I was receiving a breastjob and a blowjob simultaneously. The pleasure was overwhelming, and I felt like I was about to cum at any moment.

"M-Mother-in-law! I, I can't anymore!"

"Yes, cum as much as you want♥."

As if she already knew I was on the edge, she wrapped her breasts tightly around my glans just as I was about to climax.

Brrrrt brrrrt brrrrt brrrrt.

"Ugh!!"

I came inside her breasts.

"Haa♥… Amazing… I can feel you cumming so powerfully♥."

She smiled blissfully, clearly enjoying the sensation of my cum filling her cleavage.

Squeeeeze.

"Haa♥….. I'll clean it up for you♥. Woop♥ Sluurp♥ Heup♥ Woop♥."

She squeezed my dick with her breasts, pulling it out as a considerable amount of cum dripped from beneath them. She licked the remaining semen off my dick, savoring every drop.

"Hoo… That was amazing♥."

"Haa….. Haa….. Mother-in-law…."

After cumming, my mind began to clear, and I realized the gravity of what had just happened.

"Hehe♥… It seems like Juhyun still doesn't fully understand how much of a masochistic slave I am, yearning for my master."

"…I think I'm starting to get it."

I was beginning to grasp just how skewed her tendencies were.

"Then, please watch me… Lick♥."

"!!"

She lay flat on the floor and began licking up the semen I had spilled, showing no hesitation.

"Haa♥… I can do things like this without any shame."

"Gulp…."

She wasn't just a woman who enjoyed sex—she was someone who craved submission and domination. That was my mother-in-law.

"Hehe, anyway, this is the first time I've ever served you with my breasts and mouth at the same time."

"Huh? R-Really…"

"Yes… He didn't have a dick as big as yours, master♥."

She compared me to her former master, her husband, with a lewd smile, clearly trying to boost my ego. The thought that I had experienced something even he hadn't filled me with a sense of superiority.

"Now, let me show you the rest of the rooms. You should put your pants back on quickly."

"Ah! Y-Yes!"

I had been standing there with my dick out, completely unaware of my state. I quickly pulled up my pants.

After that, she gave me a tour of the mansion, but my mind was so preoccupied with what had just happened that I barely remembered any of it.

Later, in the living room, Yeonji finally emerged after finishing her assignment.

"Oppa."

She hugged me tightly.

'She's so cute.'

Normally, her embrace would stir my desires, especially with her breasts pressing against me, but after everything that had happened with my mother-in-law, I was too drained to feel anything.

"Mom! How was Oppa?"

"Hmm… He's a good man… Worthy of the man Yeonji chose."

My mother-in-law smiled and praised me. When I remembered the scene where she had spat on me, I couldn't help but feel a twinge of guilt.

"Then, Juhyun… no, Son-in-law Lee, pack your bags and move in."

"Ah… Yes!"

And so, my eventful life in the mansion began.