Missy my sister-in-law comes to visit about once a year. Her work made it so she had to move away from the family. She misses them greatly so she visits at least once a year, typically for a couple of weeks at a time when she comes. She always stays with us because we have a spare bedroom.
I have always enjoyed it when Missy comes to visit, she is a real looker. She is about 5 feet 6 inches tall, part Asian so she has nice olive skin. She is in great shape as she regularly works out, even on vacation. Her chest is small, I would guess an A cup at best. She has dark hair and a nice small ass.
Missy is always enthusiastic about coming to stay and seems to like staying with us, we have always gotten along well. I always get the nicest bear hugs from her when she sees me. I like getting these hugs from her, I love the way her chest presses against mine as she hugs me. She has a tiny frame so my arms easily reach all the way around her. Quite often while hugging her I can feel the underwire from her bra on my fingertips.
Missy usually tries to schedule her vacations to visit the family in October; she likes the cool air of the fall time and seeing the leaves change color. She also loves Halloween, as much as we do. Halloween is always a major production with elaborate decorations and extravagant parties. We all always go all out on the costumes, they are typically very elaborate.
We also always plan two different costumes. One that is "family friendly" and one that is more adult for the "adult" parties we go to. But that is a different story.
Like I said, Missy likes to exercise, she particularly likes to run. Due to the cool mornings in our area she does not want to run outside, so instead she runs on the treadmill in our house. The treadmill is in the same room as our TV as we like to watch TV while we run or walk. Missy always works out at the same time every day so it makes it very easy for me to be in "watching TV" when she is working out.
I usually spend more time watching Missy than the TV when she is exercising. I love watching the way her tits bounce as she runs. It also doesn't hurt that she wears a sports bra and some skin tight running shorts. Neither of which leave much to the imagination as to what her body looks like underneath.
Missy arrived as expected but she was not her usual bubbly self. I still did get my hug that is always greatly anticipated, but she seemed out of character. I asked her if everything was okay and she said it was, except that the airline lost one of her bags. She was mostly upset because this was her "workout bag". She was wearing her workout tennis shoes but her shorts, sports bras and her swimming attire were in the lost luggage.
I was pretty bummed as well. I didn't think I would get the chance to watch her exercise. I so enjoyed watching her exercise. When she ran the sweat would run down between her breasts and down her flat stomach. This was incredibly sexy to me.
Later that day Missy got a call which greatly lifted her spirits. I asked her if the call was good news and she stated "It was the airline, they found my luggage, but the bad news is that it won't get here for a few days."
"That's too bad", I said. I suggested that maybe my wife had some shorts and maybe a sports bra she could borrow to do her exercising. After all, I didn't want to miss watching her exercise. She thanked me and went to find my wife.
That night I asked my wife if she was able to help her sister out with exercise clothes. She said she was able to help with shorts but not a sports bra. My wife is bigger than her sister so I wasn't surprised when she said this. I was disappointed for a moment until my wife told me that she was still planning on exercising but that she'd just figure something else out for a top.
My wife smirked at me and said "Don't worry babe, you will still get to watch her work out!"
I blushed and said "Thanks babe!" with a sly smile. I was pretty sure my wife knew that was the only reason why was in the same room with Missy when she worked out but I was not positive. Her statement confirmed that she knew.
The next day, just before Missys normal exercise time I went in to "watch TV", she was right on time as expected. Missy was in the shorts my wife gave her to wear, they were not skin tight like her normal exercise shorts, but they did still look really good on her. For her top, she wore a white skin tight shirt that showed a little bit of her flat, toned, stomach. It looked like she had a dark colored bra on underneath but I couldn't tell exactly what color.
I handed her the remote when she walked in so that she could choose the show she wanted to watch. She was grateful as she did not like watching sports, which is what I had on. She changed it to some cooking show. I enjoy cooking and learning new things so I was enjoying the show with her, what little of it I was watching. I was fixated on her breasts; they were bouncing more than normal today as she just had a "normal" bra on.
I found myself staring more than normal as she exercised. I was being lazy today and hadn't put on my Levis. I was glad I didn't because the hard on I was getting by watching her would have been very uncomfortable in Levis. Every minute that passed as she was exercising caused her shirt to become more and more see-thru as it became wet with her sweat.
I was so focused on her soaking blouse, which was now see-thru due to her sweat and her bouncing tits in her dark blue bra, that I didn't notice the erection in my pants and the tent it was causing. Missy finished her exercising so I quickly pretended I was watching the show. She turned to leave and noticed the tent in my pants. She said to me, "It looks like you are enjoying the show". I looked up at her and noticed she was looking at my crotch. I managed to stammer "yeah" in response as she walked away.
She just giggled. I couldn't help but watch her swaying ass as she walked down the hall to her room. She glanced over her shoulder as she left and noticed I was still staring at her. She just smiled to herself. Her bedroom was just down the hall from the TV room, the bathroom was just across the hall from her bedroom. She went to her room to get her things for the shower.
Missy was making a lot of noise when leaving her room. I looked down the hall to see what the ruckus was. I couldn't believe my eyes! Missy was standing there in just her bra and panties. I was correct when guessing her bra color. It was dark blue, with matching panties. Seeing her standing there in her underwear made my cock jump in my pants. I enjoyed watching her mostly naked body as she walked into the bathroom to get a shower. She winked at me just as she disappeared through the door.
I couldn't help but wonder if she was flirting with me and if she was turned on by seeing my hard cock in my pants. I figured it wasn't either, I figured she was just comfortable around the house and with her body. I wouldn't be that lucky to have my hot sister-in-law turned on by me or even flirting with me. I was just sitting there, enjoying the show that was on when I realized Missy had been in the shower for a long time. I figured she was just shaving or something but I was concerned all the same so I went to check on her. When I got to the bathroom door I could hear noise coming from the bathroom so I assumed she was fine. I knocked anyway.
Missy answered in a husky voice "Yes?"
I replied "Everything okay in there?"