My roommate was having sex with her boyfriend and I joined in [FMF]

My roommate and I are both 21 and her boyfriend is 24. They've been together for 4 months and have been loudly having sex on the other side of my wall for the what has felt like the entire four months. Even on her period she is going at it with this man. I've complained to her in the past but she tells me that his stamina is just too good and she has to do it or he'll get grumpy. Whatever. Well, I was trying to get a paper done and he comes over and again they are at it again, thumping against my wall. At this point I have had it. I go to her room and knock on the door.

He opens the door, butt naked with his cock fully erect and hanging between his thighs. He's slick with sweat and his cock is wet from my roommate's pussy. She's half passed out on her bed, clearly reaching her limits for fucking for the night.

I told him I was trying to write a paper and he said that I looked tense. He put a hand on my shoulder and led me into the room. My roommate put a hand out to me and I went over to her. She told me to finish the night for her and that she'd join in when she was rested up. I was shocked. For one, she was asking me to fuck her boyfriend, and two she was acting like it was a shift at walmart or something. Clocking in and clocking out.

I became… curious. That's where I went wrong, I admit it. I looked at him, and his toned body and thick cock. I had plenty of cock in my life and I completely doubted that this man was capable of fucking me to the point of exhaustion like he had my roommate. I decided if it kept him quiet, I might as well bite the bullet. I pulled my pajamas off and both of them grinned. My roommate thanked me and rolled off the bed and headed to the bathroom and her boyfriend was right beside me, his hands roaming my body.

He started slow and I thought it was going to be a piece of cake. He fondled my breasts, whispered in my ear, fingered my clit the usual foreplay that any guy could do.

Then I laid on the bed and the real show began. He pressed his cock into my pussy and my first thought was that he felt bigger than he looked. He stretched me wide and dug in deep. I gripped the sheets for support and tried to hold back my moan but it came out anyway. It felt like being split in half. He finally bottomed out inside of me and grabbed my legs. He threw my ankles over his shoulders and asked if I was ready. I nodded and he took off.

He fucked me for what felt like hours. His fingers, his tongue, his cock: everything was driving me absolutely insane. I lost count of how many times I came stretched out on his cock. My nipples were sore, my clit ached, but my pussy throbbed for more. He had such good control on himself that he never once had to pause to keep from spilling early. It was like fucking the damn terminator.

The bed bounced against the wall and I realized why my roommate would never shut up. I didn't know how long this would take, only that I didn't want it to end.

When he finally came it was deep in my pussy and I welcomed it, almost like a balm to my sore cunt. He pulled out and slapped my ass saying I was a real good time.

I couldn't even move. I was exhausted. My roommate had come out of the bathroom and watched the finale and sat beside me, brushing my hair back from my face.

"We're always here to please you," she said. Then her boyfriend got on top of her and they started over AGAIN.

Half way through fucking her I got my energy back and tapped his shoulder. He then switched girls and fucked into me for a few pumps before going back to his girlfriend. He fucked both of us at the same time.

It was so weird and yet so fucking good. I didn't finish my paper because I spent the rest of the night getting railed.