A while ago, my sister-in-law, Annie Larsson, who is in her senior year of high school, came over to stay with us during her summer break.

The well-developed young woman's daily outfit consists of a camisole and tiny shorts. She doesn't even wear a bra. When she walks or sits, her bust always looks perky. She has a slim, curvy waist, and her butt is always arched alluringly.

Any man would have dirty thoughts about her, especially me, her lecherous brother-in-law who dares to act on his lewd impulses.

The term "sister-in-law" is simply too tempting to me.

"Michael, it's my first time. Go easy on me…"

Deep into the night, a young woman dressed in nothing but socks knelt before me, her face flushed as she stared at me with her glistening eyes.

"Shh. Take it like a good girl…" I said, sliding my fingers into her wet mouth.

She sucked on them obediently, her tongue greedily dancing around my fingertips. Quiet whimpers escaped from her throat. That was probably the most melodious sound a woman could make.

My name was Michael Jones, and I had tied the knot not long ago. Once, my wife's sister, Annie Larsson, came to Geordan during her summer break and temporarily stayed at our place.

In the height of summer, she wore a thin camisole and tiny shorts every day, not even bothering with a bra. When she walked and sat, her breasts always looked perky.

Her thin waist was enticing to look at, and her round, soft butt was always arched in a seductive curve. No man could keep his thoughts straight, especially not someone like me, who was both bold and dirty-minded.

The fact that she was my wife's sister made the whole fantasy even more appealing.

Sometimes, I would take advantage of her by teasing her—brushing against her chest, touching her butt, pinching her waist, and, naturally, admiring those long, slim legs.

At one point, I came to realize Annie's Achilles' heel. When she was being dominated, she couldn't bring herself to fight back and could only take it quietly.

Once, I went into the bathroom for a shower and found a pair of panties she had forgotten to put away. I was just holding and admiring them when she suddenly snatched them and held them against her chest, as if she were protecting them.

I pretended to seize them, only to hold onto her smooth breasts instead. She always wore a thin camisole at home without a bra, so it felt just like touching flesh. Reluctant to let go, I played with her softness again.

Annie was stunned for a solid few seconds. When she saw that I was aroused, she gasped and quickly bolted out of the bathroom, her face burning.

And so, after a few attempts, I could almost feel myself consumed by lust.

I quickly finished my shower and returned to my bedroom with my hardness. Seeing that my wife, Britney Larsson, was already sleeping on her side, I climbed into the bed without a second thought.

From behind, I grabbed her waist and positioned her in doggy style, yanking her underwear down to her knees, making it scrunch together.

Britney moaned. "What's gotten into you, honey? You're very riled up."

It took her a good 30 seconds before she came to her senses. Without looking back, she nudged her butt toward me. "Go slow… I'm not wet yet…"

"I just really want to be inside you. That's all," I rasped.

Britney had always been sensitive and a loud moaner in bed. Usually, I would take my time with foreplay before diving into the real game. Tonight, however, she became strangely quiet, knowing she had a guest.

I, on the other hand, wanted to create a commotion precisely because of that. I wanted Annie to hear us. So, I deliberately spoke crudely to Britney while thrusting against her round, bouncy butt.

"You like that? You like the way I'm screwing you?"

Irresistibly, Britney let out a long, sultry moan. Her rear was arched high. Gasps and whimpers slipped out from her throat like a symphony, and her seductive charm practically overflowed from her being.

"Don't stop… Oh, I love it…"

At that moment, I caught a glimpse of our bedroom door, which had somehow cracked open. A shadow stirred behind it. Was Annie peeping?

I glanced sideways again. Through the crack, I saw her kneeling behind the door, her underwear showing. With her mouth half-open and her chest heaving, she watched me, her cheeks glowing with color.

Ecstasy rushed through me. I didn't expect that Annie, as innocent as she appeared, would spy on her sister and brother-in-law making love.

To ensure Annie could watch more clearly and make this a valuable class, I disregarded whether Britney would notice Annie and lifted her abruptly, making her arch her back and stick out her hips.

That way, we would turn to face the door and the living room. Not only that, but I also stripped her naked before repeatedly thrusting against her like a wild bull.

"Oh, honey…" Britney whimpered. "You feel so good…"

Her breasts jiggled with every movement, and she couldn't contain herself from making sounds even if she tried. I had her hands restrained, so she could neither cover her mouth nor groan freely.

"Please… I'm coming… Don't stop…"

Her cries left her as she collapsed on the bed like a pool of softness. Only the firm curve of her hips, which I was holding, was still lifted high.

I slipped into my underwear and stepped into the living room, pretending to get a glass of water. I saw that Annie's door was shut tight, with lights spilling out from beneath the crack.

As soon as my footsteps sounded, the lights went out.

The next morning, there was an unspeakable tension around me.

Wherever I went, Annie would dodge me and stick to Britney. She must've been startled to see me so aggressive and Britney so humble in the bedroom when we appeared so loving and gentle with each other.

Not just that, but it was also jarring for Annie to see how Britney was willing to let me dominate her. The reality of adult intimacy completely shocked her.

Honestly, even if I had thoughts before, there was no way I could ever get Annie to sleep with me when she was always avoiding me. Funnily enough, fate gave me a hand.

That night, I was entertaining clients and didn't get home until after midnight. Britney was already asleep, but the bathroom light was on, so I surmised it had to be Annie taking a shower.

Through the frosted glass of the bathroom door, I could just make out the curves of her body, moving as if she were drying herself. My heart skipped a beat.

Pretending I thought it was Britney inside, I went up and twisted the door handle. "Honey, I just need to use the bathroom to take a quick one…"

Sure enough, the door wasn't locked from the inside. After a startled gasp, Annie pressed against the door with her hand. "Michael, it's me… A-Annie…"

By then, half of my body had already entered the bathroom. Her build was laid out before my eyes, pale with a hint of pink, still glistening with water droplets.

Her flawless, soft skin, combined with her innocent face, hit me like a lightning bolt. I felt my body reacting instantly. Keeping up the pretense, I whispered, "Annie, why haven't you gone to bed?"

"I couldn't fall asleep…" she answered, wrapping herself up in a towel, which hardly covered her breasts and core.

She hung her head low, too timid to meet my eyes, and added softly, "Why don't you get out first, Michael? I need to get dressed."

"Oh, right."

I feigned a sudden realization, reluctantly backing out. "But make it quick. I can't hold it in anymore."

Honestly, I didn't even need to pee. I waited outside, just to see Annie's bashful look. Through the glass, I saw she had stopped moving. Softly, she called out, "M-Michael?"

"Are you done? Can I come in now?" I asked, not quitting the act.

"N-No, don't!" she stuttered, audibly panicking. "I accidentally dropped my underwear and got it dirty. Do you mind helping me get a clean one?"

Her voice was getting quieter with each word. "It's in the first drawer of the wardrobe."

I went into Annie's room and opened a drawer in her wardrobe. Rows of cute underwear were neatly lined up. I grabbed a pair with a strawberry print and walked back to the bathroom door, knocking lightly and handing them through.

She cracked the door just enough, quickly taking the underwear and slipping it on.

Steam from the shower drifted out, and she stepped into view, wearing just a camisole and the strawberry-print underwear. Her skin was still glowing from the hot shower, and her decision to go braless left little to the imagination.

The way the fabric clung hinted at the curves beneath, and I could even faintly see her headlights. The underwear was snug, emphasizing her round butt in a teasing, almost perfect way.

The sight of me at the door made her pale skin flush a sultry pink. "Go on in, Michael… Thanks for waiting."

The scent of her natural warmth was almost overwhelming. I wouldn't even believe myself if I said I could hold myself back. As such, I went up to Annie and crashed my lips against hers, my arms wrapping around her possessively.

My tongue was denied entry to explore further. She must've been nervous. So, I took my sweet time kissing and licking her soft lips.

A series of reserved moans escaped from her. I was finally able to pry those sounds out of her with my dominating kisses. Her back slowly relaxed into a curve until she finally surrendered into my arms.

Yet, for a solid three minutes, I couldn't pry her lips open. I didn't know if she was rejecting me out of nerves or simply because she didn't know what to do. Thus, I decided to give her a hand—literally.

My palm found its way around her boobs. This must've been the first time a man had touched her like this because she instantly grabbed my wrist and tried to pull it away.

Thankfully, her startled gasp gave me the perfect opening, and I slid my tongue into her mouth.

Using misdirection to my advantage, I roamed freely through the warm, slick interior of her mouth, deftly capturing her tongue with nowhere left to hide.

Saliva, thick and slippery, quickly mingled between us. A kiss this searing and wet was more than enough to make an inexperienced young lady surrender completely.

When my hand slipped beneath her camisole again, testing as it wandered upward, she twisted her waist and caught my wrist. This time, she didn't force it away.

My splayed fingers were finally free to knead her soft, untouched chest to my heart's content.

Pressing my advantage and pushing my luck further, I had already kissed and touched her. So, what was left to hold back? After a moment, I released her lips and tongue, trailing my wet kisses down to the hollow of her neck.

"M-Michael, stop…" she whispered amid her panic, but she moaned near the end.

Yet, when my lips traveled to a sensitive spot, she couldn't help but let out a sweet, innocent whimper. From then on, her voice turned flirtatious.

As her soft moans grew more frequent with the quickening of my touch, my own restraint finally began to fray. Brushing my lips against her ear, I murmured between breaths, "Annie, do you like it when I touch you?"

"Yes…" she answered, almost like a moan, then softly added, "But you're Britney's husband…"

I bent down and lifted her effortlessly into my arms, carrying her into the bedroom and laying her onto the soft, fragrant bed. In a gentler voice, I said, "Let me show you how it's done, alright?"

"I… That's…"

Annie was clearly flustered, shrinking back toward the corner of the bed. Her legs instinctively drew together, her face flushed as if she had a fever. "What if Britney finds out?"

"She won't know if neither of us tell."

I didn't hesitate any longer. Seizing the moment while she wavered, I slipped both hands beneath her camisole again without resistance, closing them around her breasts.

She trembled, but instead of pulling me away, she lifted her head slightly and met me in a kiss of her own accord. I could tell she liked this kind of deep, entangling kiss, so I held back my urge to explore further for now.

As I kissed her fervently, I quietly slipped off my pants and underwear. Her tongue was repeatedly drawn in and teased by mine.

Soft, breathy sounds spilled from her nose as her body melted against the bed. Obediently, she raised her arms, allowing me to remove her thin camisole.

In an instant, a half-bare Annie lay before me. At the base of her strawberry-patterned underwear, a faint damp mark had begun to show.