19f, saw my sister's boyfriend naked,he made me Squirt all over the Couch

Okay this is gonna sound bad but I swear I didn't plan any of it. My sister Sarah (23F) has been dating this guy Mark (24M) for like two years. I've always thought he was hot but like in that "off limits" way you know? Tall, broad shoulders, kinda messy brown hair, and he has this deep voice that just does something to me.

Anyway last month Sarah asked me to house sit while she went to visit our mom for the weekend. She said Mark might stop by to grab some of his stuff but whatever no big deal. I said yes because free house right?

Friday night I'm just chilling in one of Sarah's oversized t-shirts and nothing else because it was hot as balls. I was watching TV on their big comfy couch, eating popcorn, being lazy. I hear the front door unlock around 10pm.

My heart just stopped.

It was Mark. He didn't know I was there. He walked right into the living room completely naked. Like full on balls out naked. He had just come from the gym and said he thought the house was empty so he was gonna grab a towel and shower before heading home.

I froze. He froze. We just stared at each other for what felt like forever.

And god help me I looked down. I couldn't help it. He was soft then but still... impressive. Thick. I felt my face get hot and my stomach did this flip thing.

He goes "Shit sorry I didn't know you were here" and starts trying to cover himself with his hands but honestly that just made it worse because now I'm imagining what it looks like hard.

I should have looked away. I should have said it's fine and run to the guest room. But I didn't. I just sat there like an idiot with my mouth slightly open.

Then he smiled. This slow crooked smile like he just figured something out.

He goes "You've been staring for a while now."

My voice came out all breathy. I said "I wasn't..."

"You were," he said. And he didn't cover himself anymore. He just stood there letting me look.

I remember my heart was pounding so hard I could hear it in my ears. I said something really smart like "Sarah would kill us."

"Sarah's three hours away," he said. Then he walked toward me. Naked. Not even trying to hide it anymore.

By the time he got to the couch he was half hard. I couldn't stop staring at it. He noticed obviously.

He sat down next to me really close and put his hand on my thigh. His fingers were rough. He squeezed a little and I let out this tiny moan that I didn't even mean to make.

"You want this?" he asked.

I nodded like a stupid bitch because I couldn't form words.

"Use your words," he said. His hand moved higher up my thigh under the t-shirt.

I whispered "Yes. Please."

He kissed me then. Hard and deep with tongue right away like he wasn't going to waste time. He tasted like mint and something else I couldn't place. His other hand went to the back of my neck and pulled me closer.

I was already wet. Embarrassingly wet. Like I could feel it soaking through his sister's couch wet. But I didn't care.

He pulled back and looked at my t-shirt. "Is this hers?"

I nodded.

"Take it off."

I pulled it over my head and suddenly I was completely naked on my sister's couch with her boyfriend staring at my body. His eyes went to my tits first then down between my legs. I saw his dick twitch.

"Fuck," he said quietly. "You're so much hotter than her."

I know that's terrible. I KNOW. But in that moment it made me feel powerful. Like I won something.

He pushed me back against the couch cushions and climbed on top of me. His body was warm and heavy and he had this faint sweat smell from the gym that should have been gross but just made me want him more.

He rubbed the head of his cock against my clit and I gasped. He was fully hard now and yeah I was right about the thick thing.

"You're so wet already," he said. "Been thinking about this?"

I couldn't even lie. "Yes."

"Good girl."

He pushed inside me slowly and I swear I saw stars. He was thicker than anyone I'd been with before and it stung a little but in that good way. I grabbed his shoulders and dug my nails in.

He didn't go fast at first. He just stayed there buried all the way inside me and let me feel every inch. Then he started moving. Slow deep strokes that hit something deep.

"Oh fuck," I moaned. "Right there."

"Yeah?" He sped up a little. "Right where?"

"Right... fuck... right there don't stop."

He put his hand on my throat. Not choking just holding. His thumb pressed against my jaw and tilted my face up so I had to look at him.

"Look at me when I fuck you," he said.

I couldn't even respond because I was already close. Like scarily close. I'd never cum that fast with anyone before.

He must have felt me tightening because he smiled again. "You gonna cum already?"

"I'm sorry I can't help it."

"Don't apologize. Cum for me. Now."

And I did. Hard. I grabbed his arms and my back arched off the couch and I moaned so loud I'm pretty sure the neighbors heard. But here's the thing - when I came, something else happened.

I felt this gush. Like actual liquid. It splashed onto his stomach and the couch and my thighs. I'd never squirted before. I didn't even know I could.

He pulled out and looked down at the huge wet spot on the couch. Then he looked at me and laughed. "Did you just fucking squirt?"

"I think so," I said. I was shaking.

"That's so hot," he said. Then he flipped me over onto my stomach.

He pulled my hips up so I was on my knees with my face in the couch cushion. The wet spot was cold against my cheek.

He smacked my ass hard. The sound echoed in the living room.

"You're gonna clean that up later," he said. "But first I'm not done with you."

He entered me from behind and this angle was even deeper. I moaned into the cushion and gripped the fabric.

He grabbed my hips hard enough to leave bruises and started pounding into me. No more slow. Just hard and fast and exactly what I needed.

"You like that?" he grunted.

"Yes yes yes."

"Whose pussy is this?"

"Yours."

"Say it again."

"It's yours Mark please don't stop."

He reached around and started rubbing my clit while he fucked me from behind and I was already about to cum again. I couldn't believe it. I never cum this fast.

"Cum on my dick," he said. "Soak it again."

That was all it took. I screamed into the cushion and came even harder than the first time. I felt myself gush around him and he groaned.

"Fuck you're squeezing me."

He pulled out and told me to turn around. I did. He was standing at the edge of the couch stroking himself.

"Open your mouth."

I opened wide and looked up at him. He came on my tongue and my face and some got in my hair. It was warm and salty and I swallowed what I could.

He collapsed next to me on the couch and we just lay there breathing heavy. The couch was absolutely destroyed. There was a huge wet stain and cum on the cushion and I knew Sarah would notice.

"Shit," I said.

"Yeah," he said. "Shit."

He got up and handed me the t-shirt to wipe my face. Then he went to the bathroom to get towels.

While he was gone I just lay there thinking about what the fuck I just did. My body was still shaking. My thighs were soaked.

When he came back he helped me clean up and we didn't really talk. He kissed my forehead which felt weirdly sweet after everything.

"This stays between us," he said.

I nodded.

He got dressed and left. I spent the next hour scrubbing the couch with a wet cloth and praying the stain would come out.

It didn't.

Sarah came home Sunday night and asked why the couch smelled weird. I said I spilled soda.

She didn't believe me but she didn't push it.

Mark and Sarah are still together. He's been around a few times since then. We act normal but sometimes he looks at me a certain way and I feel my face get hot.

Last week Sarah went to the bathroom and Mark whispered in my ear "Same time next weekend?"

I didn't say yes. But I didn't say no either.

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