[F25] I watched my stepbrother fuck his girlfriend… and ended up sucking him off right after.

This is one of those confessions that makes me feel both like a terrible person and the most turned-on I've ever been.

For context: my stepbrother, Nate, and I aren't blood-related. Our parents got married when we were teenagers, and while we didn't grow up super close, we always had this weird flirtatious energy neither of us ever really addressed.

He's the type of guy girls obsess over — gym-built body, smug little smirk, casually dominant without trying. I always thought he was hot but told myself it was just a dumb thought. We never crossed any lines… until last month.

He'd just moved back in temporarily while looking for a new place, and brought his girlfriend, Kayla, with him. She's sweet, pretty, totally unaware that every time I looked at her boyfriend, I pictured him pinning me against the wall and using me like a toy.

Anyway.

One night I got back from work late. I was walking upstairs to my room when I heard noises coming from Nate's. Moaning. The unmistakable wet slap of skin on skin.

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I froze.

I know I should've just walked past. But instead… I crept to his door, barely cracked open. And I watched.

Kayla was on her back, legs up, Nate drilling into her like a fucking animal. His abs were flexing, sweat on his back, hands gripping her thighs like he owned her. She was whining, begging him not to stop, and all I could think was: I want to be her so fucking badly.

I didn't even realize I had my hand in my panties until I came quietly against the hallway wall — my first orgasm in weeks.

But it gets worse.

Later that night, I came down to the kitchen to get water, thinking everyone would be asleep. But Nate was there, shirtless, drinking Gatorade straight from the bottle like some post-fuck god. We locked eyes. I blushed and tried to play it cool, but he looked right at me and said:

"You liked the show?"

My heart stopped. "What?"

"You think I didn't notice the door cracked open? You came harder than she did."

I wanted to die.

But instead I just whispered, "You weren't bad."

He stepped closer. "Bet I could make you come without even touching your pussy."

I didn't say anything. I just sank to my knees.

I sucked him off right there in the kitchen — on the tile floor, knees aching, drool sliding down my chin as I gagged on his cock. It was so wrong, but so fucking perfect. He held my head, thrust into my throat, and when he came, I didn't pull away. I swallowed it all — again — not because he told me to… but because I wanted to.

We haven't talked about it since. Kayla's still around. He still acts normal. But every time I walk past him, my thighs clench.