I'd taken the few days before Christmas off to prepare the house for the holidays. We were having a big gathering of family on Saturday and the good intentions of decorating, wrapping and cleaning had not come through as planned.
The wife and baby had left the house and I was left, stripped to my shorts to clean. I was just finishing dishes and starting on the kitchen floor when the door bell rang.
You were standing in the door holding a sack full of Christmas packages. "Where is my nephew?"
"He's not here. He went to school today so I could get some work done around here."
"Ugh... I'm leaving tomorrow afternoon to go on my cruise. I was sure when you told Mom you were going to be home today that he'd be here with you."
"Sorry, sis. But you're more than welcome to stay for a bit..."
"And how is that going to let me watch the little guy open his presents?"
"Well, we were going to spend the evening cleaning. If you give me a hand now, you can hang out until they get back and you can give them to him this evening... or you can just come back this evening, if you've got to finish up packing." I take the sack from you and motion for you to step in from the cold.
You come in and slip your jacket off, hanging it over a hook on the coat tree near the front door.
"Nah, I'm ready to go... in fact, I don't have anything else to do between now and then, but I didn't bring anything else to wear..." You motion to the dress slacks and holiday sweater you are wearing.
"I can always get you a pair of shorts and a t-shirt, or you can just strip to your undies and run around half naked like I am," we've joked like this since before we were old enough to understand sexuality, but never did anything more than flirtingly joke.
"What do you need done? I'll help out."
"Well, I was about to scrub the floor, the vacuuming needs done, and there is a stack of presents that need wrapped..."
"Where are the presents? I can do that without having to worry about changing..."
I pull out the pile of gifts and settle you into the living room with the TV remote and a bunch of rolls of wrapping paper.
I scrub the floor of the kitchen and start vacuuming. I eventually work my way into the living room... where I find you dancing while wrapping presents. You've abandoned the television, probably when the noise got too much to concentrate, and have instead been blaring Christmas music. It takes me a moment to register what I'm seeing as I see you dancing there in your underwear. I consider shouting, but opt to walk up behind you to tap you on the shoulder.
As I approach, I watch your ass move in the tight material of your panties and find a familiar, though unexpected swelling in my shorts. I try to calm myself a bit, but after glancing down, I realize that there isn't any noticeable sign of my arousal. I tap you on your shoulder.
The sudden touch causes you to squeal and spin around quickly. Seeing you in your underwear from behind hadn't prepared me for what I would see when you turned around. The quick movement had caused your breasts to shift in your "shelf" bra and your nipples were clearly visible by the time they stopped jiggling. I couldn't help but look down and gaze upon the beautiful breasts of my younger sister... though as soon as I realized what I was doing, I looked up and forced my eyes to meet yours.
"You shouldn't scare me like that.. I... ooh", move to turn back around and shift your bra, so that your nipples aren't fully exposed, "Sorry, I, um... It was hot and I didn't feel like bugging you for something to cover up with... besides... it's not like you haven't seen boobs before."
"Um... no, but it's been a while since I've seen yours or any that looked as good as yours... and well... um... what I was going to say was that I was going to come through with the vacuum cleaner. I just didn't want to scare you."
"Thanks, the bra really gives them that extra something... but... careful brother, if I didn't know any better I'd think you were hinting at another peek."
"And who's to say that you DO know better," I quip, only half joking, shifting slightly as I realize that your bare nipples caused the slight swelling to grow more fully, and without underwear on, the swelling begins to cause a tent in my shorts.
You put down the scissors and tape that you had, taking a step toward me. "Careful, Jeff, you shouldn't be having naughty thoughts about your wife while she's not around to take care of you," You glance down at my crotch, smile, and then wink.
"Well, she wouldn't have done much to take care of things, even if the thoughts were about her."
You were aware that things weren't all that they should be between my wife and I. She wasn't as affectionate as our family was, and it was obvious when hugs between you and I were more embracing than the ones you saw between her and I.
"I'm sorry; I shouldn't tease you like this then... but... just who were those naughty thoughts about then, dear brother?" Even though you felt bad about my situation, you still couldn't pass up the opportunity to tease me.
"Probably the curvy woman dancing around in my living room with her boobs hanging out."
"I beg your pardon, Mister. These boobs are NOT hanging... that's what the bra is for."
I laugh and let my eyes focus on your breasts for a moment more. "I... um... should get back to my vacuuming..."
"Listen, we seem to be making good time here... how about after you are done with that we break for lunch."
"Ok, actually aside from wrapping and vacuuming, the only other thing I need to do today is take a shower. I suppose you could always help with that too." I laugh and turn to leave the room.
I go back to my vacuuming and you back to your wrapping.
It's early afternoon when I finally finish up and put away the cleaning supplies. A quick survey of the pantry finds enough to make a couple of bowls of soup and a few sandwiches. I cook up the soup and make a few grilled cheese sandwiches. Laying out the lunch at the dinette table, I call you into the room.
You join me in the same state of undress as you were earlier, though this time, more evidence of your rising body temperature is evident, as the tops of your breasts glisten with sweat.
You take a napkin from the table and dab at the sweat between your breasts and at your forehead... "Hot soup and hot sandwiches? Are you trying to get me to take everything off?"
"Just wanna make sure you stay nice and warm... seeing as how sparingly dressed you are."
We eat and curb our conversation away from the innuendo. We talk about family gossip that we've each heard from our parents, I tell you about how the little guy is doing. You talk about work and the cruise.
After we eat, I collect the plates and start loading the dishwasher.
After finishing the dishes, I shout to you, "I'm heading to the shower, feel free to have one yourself, you know where everything is."