My world crumbled when I discovered my girlfriend and my supposed friend had been sleeping together for a month. The betrayal cut deep. Our relationship had been rocky for a while, marked by frequent arguments, and he, the snake, had always been there, seemingly trying to mediate. Twice in the past three months, I'd even blocked her number, but only for short periods. Intimacy had become rare; we'd only been intimate once, on her birthday. It was after that night, while she was showering, that I’d snooped through her phone. A failed attempt to guess her password led me to try her dad's birthday. It worked. I found messages on a new Instagram account – explicit photos, intimate conversations. They'd clearly been intimate weeks prior. The discovery hit me like a ton of bricks. I left her place that night, a storm raging inside me.

That's when my plan began to take shape. This friend had a younger sister, let's call her Sarah. She was attractive, and it was obvious she’d harbored a crush on me since we were in school. I decided to use that. I started texting her, giving her attention she clearly craved. I lied, telling her I was single. Within a week, she confessed her feelings, and I reciprocated, or at least pretended to. I started visiting my friend more often, all the while carrying on this secret relationship with his sister right under his nose.

I played with her emotions, planting suggestive thoughts in her mind. She reciprocated, trying to ignite a spark between us. One afternoon, at his house, she orchestrated a moment alone. She asked him to go to the store. When he was gone, she turned to me, her eyes locked on mine. The air crackled with unspoken desire. She leaned in, her breath warm against my lips. Our kiss was passionate, a whirlwind of tongues and hands. We clung to each other, lost in the moment, until the doorbell rang. It was my friend, back from the store. Sarah composed herself quickly, opening the door while I tried to calm my racing heart.

Three weeks into our secret relationship, the tension reached a fever pitch. We both yearned for something more, but finding a place to be intimate was a challenge. As luck would have it, the tenant in my second apartment had just moved out. I had the keys to check the place before the new tenant moved in. It was perfect. Sarah skipped college that day and took a ride to the apartment. I was already there, waiting. As I waited, I realized I was starting to develop real feelings for her. When she arrived, she was nervous. I offered her water, my eyes glued to her. She looked stunning in a maroon dress. I could barely focus on what she was saying. She asked me how she looked, and I told her she looked like the girl from my dreams. She blushed, a deep, beautiful red. It was then, as she stood before me, that I knew I was falling for her. The thought of revenge faded into the background. I leaned in and kissed her, a kiss filled with a newfound tenderness. I brushed her hair behind her ear and kissed her neck, inhaling her intoxicating scent. She responded in kind, her touch igniting a fire within me.

She nipped at my neck and shoulder, her hands sliding from my chest to my back. I returned the favor, biting her neck, eliciting a small moan and a clutch of her nails against my back. I released her skin, and she rolled her eyes up to meet mine, pouting adorably. She was both hot and cute.

I took off my shirt and pushed her back onto the bed, my hands tracing the curve of her spine down to her bouncy ass, which I grabbed possessively. We kissed again, and as I cupped her right breast, she nipped at my lip. I tightened my grip, enjoying the sensation. She pulled back slightly, asking me to wait. Then, right in front of me, she shed her dress, revealing red lingerie. My dick, already hard, strained against my jeans. She turned, giving me a full view of her body – a perfect 10/10. I was beyond horny. She climbed onto the bed and unhooked her bra, revealing perfect, round breasts. My jaw dropped. As she leaned closer, I grabbed her waist, pulling her down onto the bed and cupping those soft breasts, my thumbs circling and squeezing her nipples. Soft moans escaped her lips with each squeeze.

I began kissing her breasts, then licking them, sending shivers through her body. I bit her left breast, leaving a temporary mark, and she gave me an adorable mock-angry face. Knowing she was a virgin, my excitement grew. I kissed her belly button, then slowly removed her lingerie, revealing a juicy, wet, and clean pussy. I couldn't resist any longer. I began licking her outer lips, making her shiver. I pressed my tongue against her vulva, then slowly moved upward, from her vagina to her clit, licking it rhythmically. It smelled incredible. As my tongue danced over her clitoris, she moaned and tightened her body. She clearly loved this. I continued until she nearly came with a loud moan.

I moved over her, placed a finger under her chin, lifted her head, and kissed her softly. I whispered in her ear, asking how it felt. "Amazing," she breathed with a smile.

Unbeknownst to me, my hard dick was pressing against her belly button. She giggled, grabbing it. "It's so hard and hot," she whispered, stroking it. She quickly pulled back my foreskin, causing a slight sting, and I playfully slapped her ass. I lay on my back as she sat up, looking down at me. She ran her hand along my dick, then licked the head. "You liked this, huh?" she purred, licking me from top to bottom. She took my dick into her mouth, slipping back and forth. It felt incredible. After a while, she took it all the way down her throat, gagging and coughing. I arched my back, grabbed her hair, and pushed her back and forth, deeper and deeper. She gagged several times. Taking a deep breath, she continued, faster now. I knew I was close, but I held back, savoring the moment. Just as I was about to cum, I gripped her hair tightly and unloaded into her throat. I breathed heavily, making sure she swallowed every drop. She lay back, panting, and placed her hand on my chest. "I love you," she whispered. "I love you too," I replied.

After a few minutes of rest, she climbed on top of me, pressing her body tightly against mine, her vulva grinding against my dick. It was so tight inside her. She moved slowly at first, feeling me deep within her. Then she picked up the pace, moving up and down in a rhythmic dance. I gripped her breasts with one hand and her waist with the other. Her moans were music to my ears. With each passing second, it felt better and better. Her moans told me I was hitting all the right spots, stimulating her clit perfectly. She was a natural. In that moment, I knew she was better than my girlfriend. I decided to break up with her after this. I slapped her ass hard. A loud moan escaped her lips as I continued to spank her harder and harder. Her moans turned into screams. I held her waist tightly, pressing her down onto the base of my dick. I was six and a half inches inside her, and she tried to push away, but I wouldn't let her.

She slowed down, whispering, "Baby, baby!" I knew she was about to cum. I pushed her to the side, rolling over with her still inside her. I didn't stop, continuing to fuck her as she lay beneath me. Then, she screamed loudly and came. I kept going, the intensity building. I was sweating profusely. A sudden chill ran through my body as I came, unloading deep inside her and pulling out to shoot the rest onto her belly. She was sweating too. She cleaned herself and the cum off her stomach with wipes. We were both exhausted and rested for a while.

Catching my breath, I turned her around, grabbed her waist, and pulled her back, positioning her on her knees. I began rubbing my dick against her clit, the friction making her shake. She was incredibly wet. Her legs trembled, struggling to maintain the position, but she held on. Slowly, I started to slide into her. Her walls tightened around me, her muscles clenching with each inch I pushed deeper. The sensations were intense, radiating down her legs. My gaze drifted to her asshole. I rubbed it with my thumb while simultaneously spanking her ass with my other hand. As she moaned, I picked up the pace, fucking her pussy with abandon. Pulling out, I inserted a finger into her ass. She jumped, protesting. I tried to reassure her and continued fingering her anus. She winced in pain, understandably, since it was her first time.

I grabbed some lubricant and applied it to my dick and a few drops to her ass. I continued fingering her with two fingers for a while as she screamed in pleasure. Slowly, I began to push my dick in. Before I was even two inches in, she begged me to stop. After showering her with kisses on her back, we tried again. I pulled her legs back and pushed, finally penetrating halfway. She screamed, burying her face in a pillow. I continued slowly, inch by inch. Once I was fully inside, she grabbed the bedsheet tightly. I didn't stop, I banged her hard. When I finally pulled out, she collapsed onto the bed, covering her ass with her hand, tears welling up in her eyes. I spooned her, making sure she was comfortable. We rested for a long time. With four hours left, we went for two more rounds, including one in the shower.

Over the past ten days, we've been intimate seven times. We've become incredibly close, and I've ended things with my girlfriend. Sarah wants to move forward with our relationship and even talk to her brother. I'm falling for her too, but I know this is a disaster waiting to happen. We have a date today, and I need to figure out how to talk to her about this.

How can I even begin to explain the situation to my friend?