Swimming with the family

Mom works around the house and cooks us lunch, but otherwise leaves us alone to work. We make our way through another app release, and I help Ashley with setting up some digital marketing campaigns. Through some clever scripting, I automate some tasks she has been manually doing and increase her output significantly. She only shakes her head in amazement, but I push past the script and onto the next task.

By the time I hear Kelly yell her arrival from downstairs, Ashley has returned to her room for some potential enterprise client meetings. My younger sister trots upstairs and enters my room with a knock. I turn away from my computer to see her standing in the doorway, just as this morning, with a grin on her face. "Ready to party?" she asks. She drops her bag onto the floor behind her, and it lands with a heavy thud.

"I can't believe you have to carry that thing around all day," I say, pointing at it.

"Yeah, you and me both. I think I already have back problems."

"Oh? Really?"

"Yeah. My lower back is pretty sore most days." She rubs it with one hand and sighs.

"You know, I have been studying physiotherapy and message. I could give you a back massage later. It might help."

She arches her eyebrow. "Seriously?" The doubt in her voice makes me chuckle.

"Seriously. I've been helping Mom sometimes."

Her face scrunches in surprise. "Wow, I thought you were joking. Okay. I'd love that. But not now. It's time to party!" She beams at me and dances down the hallway. "Get your swimsuit on, dude!"

I chuckle again as the sound of her bedroom door closing reaches me. I quickly put my swim trunks on and slide on some sandals. I look at myself in the mirror and am surprised at the muscular man staring back. The faint differences are gone, replaced by a body that looks like it has been through years of continuous exercise. A faint imprint of my dick can be seen pressing down my leg. "The fuck?" I murmur... "This is crazy." I flex and contort my muscles, equally enjoying and fearing what I see.

After a few minutes, I check my phone. Kelly is still getting dressed. I wander down the hallway to her room and knock on the door. "Almost ready?" I ask through the door.

"Uh. Almost," she yells back. "I'm having some issues, actually."

"Are you okay?" I ask, my voice sharpening.

"I'm fine... Just... I'm going to open the door. Don't laugh?"

"I would never laugh," I say back.

I wait for a moment until the door opens. Kelly's room is the stereotypical popular girl room: pink walls, makeup stand, ornate four poster bed, the works. None of those things are noticed by me, though, as my eyes focus on the beauty in front of me. Kelly stands beside the door, hand resting on the doorknob, wearing a bikini that I am sure is a size too small. Her other hand covers her breasts, and she tries to hide her lower body behind the door.

"What's up?" I ask, waiting.

"My bikini...seems to have shrunk." Her voice is soft and shy, wholly unlike the demanding and vulgar voice I have grown accustomed to lately. "Do you think it is too small? If it is... I don't know. I just won't go swimming, I guess. I don't have another."

She waits... I wait... "Well, are you going to let me see it or hide behind the door?" I say, and push into her room. She gasps, but I ignore her and casually plop onto her bed. "Let's see it," I say, giving her a twirling motion with one hand.

My bravado dies in my throat, though, as I look at my sister. She closes the door behind her as she turns, dropping the arm covering her top in the process, and stands before me. "What do you think?"

The top is barely able to contain her breasts. They aren't huge by any means, but they're larger than Ashley's. The bikini fabric sinks into them, causing the flesh to bulge out in inviting waves. Her nipples are barely visible; soft gumdrops wrapped in fabric. My eyes drift down her toned stomach and onto her waist, enjoying every bit of smooth, creamy skin along the way. The bottoms fit better on the front, covering everything, but the breath leaves my chest as she turns around and shows me the back. The bikini is a thong, revealing nearly the entirety of her round, firm ass to me. "Uh," I stutter, eyes locked onto her beautiful body. She runs one hand down her left buttcheek, the flesh deforming beneath her touch.

"It's too small, isn't it?" she asks. She turns back to me, her cheeks flushed strawberry red, and our eyes meet.

"It is small. But, if you don't have anything else, it's fine. It's just family there. I wouldn't go taking this to the lake house, though."

"Cheeky," she smiles at me but nods. Her cheeks return to their normal creamy color. "Alright. I'll wear it. I definitely need a new bathing suit, though. I guess I've put some pounds on since last summer." She looks herself over in the mirror, sighing, then turns to grab a beach bag on her makeup stand. She pulls a cover-up out of it and slides it over her shoulders. "Alright, let's go."

She looks me over as I stand up from the bed, then her eyes narrow as her blush returns. "Dude, when did you start working out?"