He cheered us on from the other side of the locked door, not realizing I was in there fucking his girlfriend

This is not an endorsement of infidelity.

Like all great stories, though, it starts outside the bathroom at a college house party. I was 21. I'm definitely the type who needs to take a leak every 30 minutes when I've been drinking, so I was taking frequent breaks away from the dirty blonde I had been dancing with all night to go upstairs and relieve myself. This time, however, the door was closed and locked.

"Just a second," I heard from the other side of the door. I could hear the tone in the girl's voice. Those words were spoken through tears. I waited patiently as she ran the sink for a moment before coming out with barely-disguised puffy red eyes. She looked down at the ground and tried to scoot past me, but I reached a hand out and gently stopped her.

"What's going on? Someone hurt you?" I asked her.

"No, it's nothing."

"Are you sure? Because I can go beat him up if you need me to," I said, throwing some light air punches. I'm not much of a fighter, so it was a completely hollow threat, but she got a laugh out of it.

"You have no idea how much I'd like that," she said.

"Point him out to me, I'll go get him."

"He's not here. That's the problem. My stupid fucking boyfriend left me here alone to go score drugs with his dumb friends."

"I can call someone to come pick you up."

"No it's fine, this happens. I just need to keep calling until he picks up."

At this point I was practically dancing in place. I rushed the conversation, excused myself, and shut the bathroom door behind me. While I was in there, I could hear her footsteps slowly make their way down the stairs right on the other side of the wall, stop halfway down, then come back up. I couldn't help but smile a little bit in the mirror as I hurried what I was doing.

Expecting to see her standing in front of me, I swung the door open to find... no one. I looked up and down the hall to see her sitting on the ground, back against the wall, texting someone. I walked over and carefully slid down the wall until I was sitting beside her.

"I couldn't go back down yet. Not like this," she said.

"Understandable."

She looked up at me and said, "you don't have to stay here with me. But thank you."

"No, I actually kinda like it up here," I said. "Closer to the bathroom."

She laughed. "I'm Mandi, by the way," she said. I gave her my name and reached out a hand. She laughed again and shook it.

We stayed there chatting about the party, the people, and of course, her boyfriend. He finally texted her back just to say, "meeting the guy now. Be back soon." The tears started forming again in her eyes, and I felt emboldened enough to reach over and wipe them away with my thumb.

"I'm sorry, I'm such a fucking mess," she said, wiping the tears off as well.

"You're fine. Anyone would be this way in your situation," I said. The tension was thick in the air by this point, with neither of us wanting to make the first move. As we sat there staring into each other's eyes, we heard footsteps coming up the stairs.

"Shit, I really don't want anyone else seeing me like this," she said, picking her phone up off the floor and walking into an open bedroom. I lifted myself back up and followed her just in time before the person came around the corner. She shut the door behind us. I sat down on the edge of the bed and she sat down next to me.

Now's as good a time as any to describe Mandi a little bit for you all. She was short, but looked taller than she was because of her skinny frame. It's hard to pinpoint her hair color - it was a blend of brown and auburn with light blonde streaks. Her face and body sparkled with little bits of glitter here and there. Tucked into her jeans was a sort of lacy black top, see-through around her sides and modest around her breasts, which were quite big for her otherwise petite body.

We sat in silence as she wrote a lengthy text message, deleted it, rewrote it, deleted it, rewrote it, and so on. She threw her phone down on the bed in frustration.

"Don't write anything right now, it's not going to come out how you want it to," I told her.

"I know, I just... can't think of anything else," she said. I looked her up and down, but kept my mouth shut. Finally, she looked back at me and saw me looking at her. Our eyes met, and she leaned in to kiss me. It lasted only a few seconds before she pulled away and stood up, angry at herself.

"I should probably go," I said. I got up and walked toward the door.

"No," she said. I stopped in my tracks, hand on the doorknob. "Lock it."

"What?"

"Lock it. The door."

"No, come on, this is crazy."

"Yes, it's fucking insane, but I want this. I need this," she said, coming closer to me and putting her hand on my chest. That was like pushing my "on" switch. I locked the door and embraced her, leaned down and lifted her just a little so we were on the same level and I could kiss her. We stumbled our way toward the bed and landed with me on my back and her on top of me, still making out. I could feel her rubbing her body against mine. My cock stiffened in my jeans from the friction of her grinding on it. I reached down and started tugging at her shirt, untucking it from her jeans. She sat straight up on her knees, looked down at me, and pulled the top over her head. She reached behind her back to undo her little black bra and threw it on the ground as well. I unbuttoned my shirt and twisted it off of my body.

When she came back down on me, it was skin-on-skin now as her tits hung down and pushed against my chest. I wrapped my arms around her back and dragged my fingers across her bare back. One hand crept up and held the back of her neck while the other moved down her body and into her pants. She stopped once more and stood up. I kind of figured this was the moment of clarity and that the fun was over, but instead she uttered the four best words in the English language: "take off your pants."

We kicked off our shoes, unbuttoned our jeans, and slid them down our bodies at the same time, watching each other as we undressed. I pulled down my boxers as she took down her pink panties.

"Holy fuck," she said, looking down at my erect cock. "That is... wow. I think that might break me."

Now I've been humble and honest about this topic many times in the past: I'm not the longest guy in the world, or the thickest, but I have a nice combination of both that is known to make good first impressions. Also, as mentioned, she was a very thin and petite girl and also 19 at the time and relatively inexperienced outside of her boyfriend and a few others.

She climbed back on top of me, grabbed my cock, and guided it into her pussy. It was a good thing she was on top because she was able to control just how deep it went, which wasn't very deep at first. It kept poking out whenever she'd lift herself up, but I could feel her body adjusting to me and getting wetter by the second. Soon, she was able to take it as deep as she could: about three-quarters of the way down. She took it slow and deep, gripping my chest harder with each push and moaning louder. She closed her eyes and all that anger, sadness, loneliness, frustration, and tension left her body. All that was left was a deep sense of satisfaction and triumph: reclaiming her body and mind in the best way possible.

She tried going harder and deeper until she landed hard against her cervix and had to climb off of me to regroup for a moment. I laid her down on her back and got on top of her. I'm a pretty tall guy - about 6'3" - fit and with a slender frame myself. I completely covered her petite body with mine when I was on top of her and I could tell she loved that. She looked up into my eyes with a certain tenderness of someone drunk on pure lust. I guided my cock into her pussy and slid in. As soon as I got my bearings and figured out how far I could go, I got myself into a rhythm fucking her. Her moans grew louder and more intense as she neared orgasm. She wrapped her arms around me and held me tight against her body as she came, kissing my neck and chest as she came down from it. I started fucking her even harder and her moans began to draw some unwanted attention.

Knock. Knock. Knock. I stopped thrusting and we looked at each other in panic.

"Ayyyy don't stop cuz of me!" the voice yelled from the other side of the door. We heard more pounding on the door and some grunts from the clearly intoxicated man as he presumably thrusted his pelvis into the door to mimic sex. "Hit that shit good!"

I looked back down at Mandi, who was covering her mouth with her hand. Her eyes screamed pure terror at me. "That's him," she said. I looked back at the door. Her boyfriend's friend had now joined in the cheering section and the two of them were urging us to keep going, not knowing what exactly they were encouraging.

"Hey come onnnnn make her scream again like that!" He then moaned in a high-pitched voice: "uhhhh ooohhh yeahhhh fuck meee fuck me harderrrrr," then the two laughed.

"Where the fuck is Mandi, let's go already," his friend said.

"I don't fucking know, let me call her," her boyfriend responded.

She looked down at her phone laying on the bed and quickly snatched it up to turn down the volume. As soon as it hit 0, his call came through. She held it in her hands, contemplating if she should answer it. She ultimately decided to decline.

"Fucking bitch hung up on me," he said. "Spends all fucking night texting me her shit then won't fucking pick up when I call."

"Let's just fucking leave her bro," his friend said.

"Yeah, fuck it, let's go. She'll find her way home eventually."

We listened as the two walked down the hall and down the stairs.

"I'm sorry," I said. I got off of her and she sat up on the edge of the bed.

"Don't be. That's how he always talks," she said.

"I think you know what to do," I told her.

"I know, I just..." she put her head in her hands, took a deep breath, then grabbed my hand and pulled me closer. "I want you to finish," she said.

"Are you sure?"

"Yes, I want to make sure you gets yours. You deserve it."

I bit my lip, then told her to get on her hands and knees. She bent over and stuck her bare ass out for me. I slid my cock back inside her and grabbed her waist tight to push as deep as I could. In this position, I was able to go even deeper than before without hurting her so I pounded her good and hard. At first she was shy about letting herself be heard out of fear he might come back, but she let herself go as the fucking went on.

"I'm gonna cum," I announced. I pulled out and came across her back with at least a few big globs firing up into her hair. I apologized profusely, but she didn't seem to mind. I opened the door, checked that the coast was clear, then darted to the bathroom and back with the hand towel that I used to wipe her down. As soon as we got dressed, her phone rang again. She apologized and took the call.

"I'm at the fucking party, where the fuck are you?" she screamed. "I went out for a walk because you weren't picking up and I needed some air. ... When did you get back? ... I'm out back now! ... Fine, I'll be right out. ... No I'm not gonna fucking hang up on you again."

You get the idea. She hurried out of the room, down the stairs, and out the front door. I went to a window and watched her get into the car with her boyfriend and his friends and drive off.

The next morning I rolled over in my bed, head pounding furiously, and grabbed my phone. I had a new friend request from Mandi. I added her back and we started messaging. She apologized for leaving without saying goodbye but he was being forceful with her. I was unbothered by it. She told me about how he wanted to have sex with her that night after they got home, and she was so worried he'd find out. Her hair still stuck together from where I had cum in it. She could still feel traces of it on her back. Her pussy still throbbed from our encounter. She smelled like sex. Fortunately, she said, he struggled to get it up and passed out soon after from whatever Godforsaken combination of pills and booze he had taken. The thrill of almost getting caught excited her nonetheless.

I'm sure at this point you all are wondering what happened next. Did she break up with him and run away with me? Well... no. They stayed together for probably about a year after that, though that didn't stop us from continuing our affair during that time. A few close calls here and there but we never got caught. He never would've known if she hadn't told him during the argument that ended their relationship for good. All's well that ends well, I suppose!