Fucking My Wife's Co-worker in Quarantine

I come home from work and I get a call from my manager that one of the people on my floor tested positive for covid and now I have to go get tested. I tell my wife, run and get tested and when it turned up positive, she got tested too. Thankfully hers was negative because she has asthma, but that left us with the problem of keeping separated in a one bedroom apartment. At this same time, my wife's co-worker, Sarah, was having a similar experience. She was asymptomatic positive just like me and had to get out of the house she shared with her sister and brother-in-law. Luckily, another of my wife's co-workers, Beth, had a 2 bedroom apartment to herself and she had just passed her 14-days in quarantine and invited Sarah to live at her place temporarily, so her family wouldn't get sick. My wife relayed all this to me via text and I joked that it was too bad they couldn't accommodate me as well. Well, she took it seriously and they offered me the living room couch. I jumped at the offer; anything to keep my wife safe. I didn't know Sarah or Beth too well, but having met them a few times at various work functions, they seemed normal enough, and we didn't really have any other options. So I'm holed up in this apartment without a lot of privacy, it doesn't help that the living room is sort of the "central hub" of the apartment (lots of space, right next to the kitchen, the big TV is there). Sarah's a short brunette with long, straight hair. She is obsessed with working out, she used to spend every day at the gym. Now that she's quarantined she spends at least 2 hours a day doing kettle bell exercises, planks, and my personal favorite pike-ups. She does this all in the living room because it's the only room big enough. I usually pretend to play video games, but when she's bending her firm, sculpted ass up in the air, I can't help but look. She's definitely caught me staring a few times, but she would just smile and unless it was my imagination, stick her ass up a little higher. She would always wear tight yoga pants and just a sports bra. At all those work functions, I never thought her tits were anything extraordinary, but seeing them held back in that sports bra, I could tell she was carrying a pair of Cs at least. She has a tan, olive completion and a beautiful face complimented by bright green eyes, a short, sharp nose, and thick, luscious lips. With her tight body, perfect ass, and stunning face, I'm surprised she even works an office job with my wife. She could easily give it up to be an Instagram model, but I think she's too self-conscious. A few days into our lock down and we get in a routine of watching a movie every night. The more boring the movie, the more we'd talk and get to know each other. Sarah is one of those "natural food" paleo diet people. She's always going on about organic food and how we shouldn't eat anything processed. I would humor her and agree, but I really couldn't care less about that stuff. I'm a lean 200 pounds at 6'3, I eat everything from pork rinds to twinkies, but as long as I do my 75 push ups a day, I seem to stay fit. I just have one of those metabolisms, but I would nod my head with everything she said about "how your body just *feels* better eating natural foods". Whenever I agreed with her, she would look down, look back up at me, laugh, and then bight her lip. Like she was going to say something, but then thought better of it. Usually Sarah stays up late and sleeps in, but yesterday morning, we both woke up early and decided to work out together. Beth was out buying groceries, she's an early-to-bed early-to-rise type. Sarah and I weren't doing much of the same exercises, but we decided to play a game while we were doing our Triceps. We locked eyes while doing planks, trying to outlast the other. I was just staring at her pressed-together tits the whole time before I finally collapsed and she laughed. We were finishing up and she asked me to help stretch her legs. I was on my knees, and pulled her right leg towards her as she lay on her back and she let out this hot moan and said "ohhh, that feels great". I moved to her left leg, my knees on either side of her right leg, my half-hard cock resting at the top of her thigh. With my whole body, I pressed her leg back towards her face. I needed to hear that moan again. I'm practically on top of her, pressing down hard, making sure to not hurt her. Our eyes lock again, I can tell she was holding it back, but she let out a deeper, more breathless moan. "ohhhhh, yeah, mmm..." I'm getting harder now and just as I was about to press into her so she could feel it, Beth walks in with groceries. With the moment gone, Sarah and I separated and helped Beth unload the groceries. "You guys couldn't wait for me?" Beth asked. "I need a workout buddy too." "Sorry," I told her. "We both woke up at the same time and figured we'd get a jump start on the day." She laughed and said, "That's a first for Sarah, she's never up before noon." "You and I can work out tomorrow morning," I told her, "There's no way Sarah wakes up early two days in a row." That night, Beth was fast asleep in her room and Sarah and I were on the couch watching TV. Sarah wasn't wearing anything particularly sexy. She had an oversize t-shirt on over baggy pajama pants. But she was acting coy. I got the distinct impression that as she sat on the opposite side of the couch from me that maybe there wasn't anything under the t-shirt and PJ pants. It was late, I put some movie on Netflix and we watched without really paying attention. Beth kept the thermostat low while she slept, so I offered my blanket to Sarah. She said we could share it, so we moved closer together on the couch. A little while later, she rested her head on my shoulder and a little after that, her hand was on my thigh. I wasn't sure if it was my imagination, but it seemed like she was rubbing my thigh. My heart was beating a million miles a minute now, we had been not-so-innocently flirting up to this point, but I had never actually cheated on my wife. Thinking back to when I was single I always misread situations like this and it usually backfired on me immediately. At this point, I'm sure Sarah wasn't even flirting with me, and I'm sure I'm just imagining her stroking my thigh. I start to calm myself down, nothing is actually going to happen tonight. But then without warning her hand moved up to my dick. She looked me in the eyes and grabbed my shaft through my sweatpants. She was biting her lip again. Neither of us said anything, our lips touched and we started kissing passionately. Our lips were pressed hard against each other until our mouths opened and our tongues swirled around each other furiously. In one swift movement, Sarah pulled down my pants and my hard cock sprung up eagerly. Just as eager, she licked the tip with a smile before thrusting all of me in her mouth. My full 7 inches hitting the back of her throat as her head bobbed up and down. I couldn't tell you if it was 30 seconds or 10 minutes, but she finally pulled my cock from her mouth with a gasp. Saliva dripped from her mouth onto my cock, which had never felt so hard. She took off her t-shirt with a flourish, just as I thought, nothing underneath. Her tits were even bigger than I had realized, I grabbed them with both hands before sucking on her tiny nipples that were already hard from the cold living room. She let out a giggle of delight and dropped her pants; her naked body was a sight to behold. Her beautiful breasts hung over her flat stomach which led to her shaved pussy that was already glistening wet. I took off my shirt and invited her to sit on my lap. She wrapped her legs around me and guided me inside her. She was so tight and so wet. She began bouncing on my cock with excitement. She threw her head back and moaned like she did when we were stretching, only lounder this time. Her arms wrapped around my neck, she continued slamming herself down onto my lap. She started grinding her hips deep on my cock. As she twisted left and right, I could tell she was massaging her g-spot with the head of my dick. She started riding me slower now, up and down the full length of my dick. Her eyes started to twitch before rolling back in her head and then her body started to shake. She pulled me close to her and whispered in a breathless gasp "Ahh... I'm... coming..." she gripped my dick with such strength as she came, it felt amazing. She stood up and walked over to the ottoman. She climbed on top of it on all fours, turned and beckoned me over with one finger. She stuck her ass in the air like all those times I had seen her doing pike-ups. I slapped her ass and she let out another excited giggle. I grabbed either side of her perfect ass and thrust back inside her. She moaned again as I shoved every inch into her. "Oh, please, fuck me hard". I did as I was told and started fucking her as hard and I could. Our thrusts perfectly matching eachother, so I hit her g-spot with every pound. She started breathing fast and whimpering lustily. I could tell she was building up to another orgasm. I slapped her ass again, harder this time so that it left a perfect red imprint of my hand. She gasped and panted "oh my... fucking god... don't... fucking stop..." I slapped her ass again and pounded her as hard as I could. I was losing steam, but I wanted her to come again. Another minute and she did, "ahhh... aaahhh..." she moaned, and then in one breath gasped "oh-my-god-fuck-I'm-coming!" She squeezed my dick even harder than before. She came in waves, hard squeeze, then pause, hard squeeze, and then pause. Her orgasm felt like it was pulling me inside her, begging me come inside her. As if she could read my mind she turned around to me and said, "I want you to come." I sat back down on the couch and she jumped back on top of me. She started slow with her back arched and then would grind hard into me. She started to pick up speed, always going up slowly and then coming back down hard. She started gripping hard on the way up and relaxing on the way down. She was going really fast now, it felt like fucking a pornstar. She put her arms around me and pulled me in close, her soft breasts pressed into my chest. Her lips touched my ear and she whispered "please, please come for me. Come deep inside me... I need it..." That was all I needed, I let loose and came deep inside her, moaning "oh, baby, I'm coming so fucking hard". She kept riding me and her tight squeezes made cum shoot out of me and into her with every upward thrust. She slowed down and we just sat there, me inside her. My cock still twitching from my orgasm, her pussy clenching in response. We started kissing again and she pulled her nails down my back. It sent a shiver down my spine. We looked at each other for a while, saying nothing. Then she stood up and smiled down at me. "That was really good, we might have to do that again." She started getting dressed and I followed suit. When we were both clothed again, I walk over to her and she pulled my head down and kissed me deeply. I grabbed her ass as she twisted her tongue around my mouth and she let out that sexy giggle. I was already starting to get hard again. But she spun around and walked back to her room without another word. I laid back down on the couch and looked at the time, 1am. I was supposed to be up in a few hours to work out with Beth. I had never done something like this before and I hadn't thought much about the consequences until now. Had I made a mistake or was I just lucky enough to get away with this? Even as guilt started to creep into my mind, I couldn't help but wonder if Beth would need help stretching in the morning...