After I graduated from college, I moved in a new apartment and shortly afterwards met my girlfriend Becky. I'm not a very attractive guy, so I was incredibly lucky to have managed to get her. At the time, Becky was twenty-five and a total knockout. She had a cute button nose, a killer smile, and long, dark brunette hair, which she usually put in a pony-tail. She worked out a lot, and her body showed it. She had a small, tight butt and a slim, defined torso. Her breasts were a large C cup, full and round, sitting high on her chest and topped by bright pink, slightly puffy nipples. The first time I saw her naked, I almost came just from the sight of her.
Six months into dating, my roommate moved out, and through Craigslist I found a new roommate, Mark. He was an investment banker about my age, and after a couple of interviews he looked like a pretty nice guy.
The first time he met Becky, though, I was a little worried. He had just finished moved in when she came over, and when he walked up to say hi he had his shirt off. It was then I noticed how ripped he was. Becky clearly noticed it, too. When they shook hands, she stammered out a hi, and kept looking him up and down. He did the same thing, too. There was a bit of electricity in the air that I couldn't help notice.
That night, Becky stayed over. She seemed a little distant during sex. Afterwards, as we were getting ready for bed, she asked, "Does your roommate have a girlfriend?"
I said I didn't know, although I was pretty sure he didn't. "Why do you want to know?" I asked.
"Oh, he was checking me out a little when we met. Did you notice?" she said.
"A little," I said.
"Ooh, did you like him checking me out?" she said mischievously.
"I guess?" I said. I didn't, really.
She smiled and hopped into bed. "Good night!" she said, and that seemed to be the end of that.
Over the next few weeks, though, I noticed that Becky started wearing a lot more skimpy clothes when hanging around our apartment, especially when Mark was around. Even when I told her that he was going to be home that night, she would "just forget" and walk into the living room wearing a tight tank top and boy shorts. Sometimes she would even call attention to it, and say, "Oh, Mark, I didn't know you'd be here! Well, it's not a problem to wear this around you, is it?" The first couple of times Mark would just say that he had no problem at all. After that, he would grin and make some joke about how she could wear even less. I was hoping she would be upset about that, but instead she would just giggle.
I started getting a little angry about it, especially when Becky would be especially provocative. Sometimes she would laugh especially hard, or she would jump up quickly and walk fast to the kitchen, causing her tits to jiggle and bounce in her top. Mark even called her out on it once, when she offered to get him a beer. "Only if you run to get it," he said and grinned. She just laughed again, and then jiggled over to the kitchen, watching him while he watched her.
Another time, we were watching TV in the living room and Becky and Mark started talking about sit-ups, and Mark had said that he could do a thousand, and to prove it he pulled up his shirt to show his ripped abs. Becky said, "That's nothing," and pulled her own shirt up all the way to the bottom of her breasts to show off her own tight stomach. She had a huge grin on her face as she watched Mark gawk at her body.
As long as the flirting was done with clothes on, I guess I would be fine with it. Plus, a part of me deep inside thought it was pretty sexy that my girlfriend was showing off so much. I was lucky to have her, shouldn't I?
But one night, after we had gone back into my room to go to bed, Becky had taken off her shirt and was just in her bra and underwear. I was lying on the bed reading, and she was at my desk at my computer, when Mark knocked on the door and asked if he could borrow a pen. I was about to get up to answer it when Becky quickly stood up and said, "Just a minute!"
Then she whispered to me, "sweetie, do you want me to answer the door in my underwear? Wouldn't that be sexy?"
"Er, well..." I stammered, but she was already walking to the door. She swung it open and smiled as Mark's eyes went straight to her body. Her underwear wasn't very fancy, just a plain black bra and panties, but for the first time he could see how great her entire body looked.
"Hi," she said, smiling, and handed him a pencil. "Here's your pencil."
Mark took it from her without moving his eyes from her chest. "Thanks," he said. Then he broke out into a big grin. "I should probably borrow more stuff."
Becky laughed and pushed him playfully in the chest, then closed the door. Her eyes had a wild look to them. "Did you like that?" she whispered to me. "Did you like how he looked at me? I bet you did!"
She jumped on the bed and attacked me before I could answer. She had two orgasms that night, which she had never managed to have before.
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The next few nights Becky and Mark kept up their flirting in the living room. Mark dropped all pretense of not staring at her most of the time, and he even started wearing tighter shirts and sometimes no shirts. Becky would stare at his chest almost as much as he was staring at hers. I didn't say anything, because I was falling in love with Becky and was hoping that she was just turned on by teasing him. I brought it up once, but she dismissed it and said that he had already seen her in her underwear, so there was nothing wrong with being in tight clothes anymore. I guess she was right, as long as she kept the teasing respectful.
Becky had other ideas, though. One night the next week, we were back in my room hanging out. We were both lying on the bed, Becky wearing a bra and pajama pants, when Mark knocked on the door again.
Becky got up and walked over to the door. I figured she would answer it in her bra again, but at least this time she was wearing pants, and after last week this wasn't so bad. But on her way to the door, she suddenly turned to me, winked, reached behind her back, unsnapped her bra, and dropped it on the floor. Her gorgeous full breasts popped free. Before I could say anything, she turned back and walked to the door and opened it. Mark's eyes nearly burst out of his head when he saw her.
"Hey," she said grinning widely. "What's up?"
"I just...um...wanted to see if David had a calculator I could borrow," he said, slowly, staring openly at her tits and pink puffy nipples.
She giggled and blushed slightly at the attention. "I'll see," she said. She twisted her torso to me, giving him an incredible profile view of her breasts. "David, do you have a calculator for Mark?"
I was very embarrassed and jealous. "No," I stammered. "I think it's out in the hall."
