I was having a wonderful time with Kate. Our nudism around the house when Mom was out drove me wild. Often I couldn't resist wanking but Kate didn't mind at all, sometimes she would put on a bit of a show for me. Kate's beauty stunned me every time and she knew it.
Unfortunately Kate's visit was coming to an end, today was her last day. Kate, Mom and me were sat around the breakfast table. Mom was leaving for work soon and was wearing a black pencil skirt and a white blouse. Her blouse was quite thin and her bra was visible through it but I was more focused on Kate (no surprise). Kate was in her pajamas, a little pink vest and matching pink shorts. I was also in my PJs but far less interesting shorts and T-shirt.
Mom was getting her things together for work when she suggested the three of us meet up for lunch so she could see Kate before she went back this afternoon. Kate and me agreed and Mom left for work.
"What are your plans for this morning?" I asked Kate.
"I'm going to see a friend before I leave. Just a quick shower then I'm off." Kate replied. "And before you ask, yes you can watch." Kate knows me well.
I followed Kate into the bathroom and threw my clothes off in a flash. Kate smiled. She turn the shower on then, with her back to me, pulled her shorts down to her ankles and kicked them off. Amazing ass. She turned a bit so she was side on to me and pulled her her vest up, over her breasts, over her head and dropped it on the floor. Amazing breasts. She turn to face me in her full naked glory, her hands on her hips framing her trimmed bush.
"You're the best sister ever." I said as I began slowly stroking my cock.
"I know." She giggled and sat on the toilet to piss. She kept her legs open to make sure I could see the golden stream coming from between her pussy lips. When she finished she stood up, without wiping, and got in the shower. Kate didn't do more than wash herself (no time for a show) but it was beautiful to watch. The shower was quick and she was drying herself with a towel when I came. I had picked a black thong out of the clothes hamper used it to catch my load.
"I love cumming in your underwear." I said as I held up the spunk covered thong.
"I don't wear thongs, they must be Mom's." Kate finished drying and walked out of the bathroom (naked of course) leaving me slightly guilty and very aroused about cumming in my Mom's underwear.
I clean myself up a bit and left the bathroom. I went into Kate's bedroom. Kate was wearing blue panties with little red flowers all over and a matching bra that she was just putting on when I entered.
"Didn't you see enough in the shower?"
"I could never see enough of you. And today will be the last time for a while." I sat on her bed and watched her getting dress. Over her very cute underwear she put on a pale green dress. It was sleeveless, buttons down the front to her waist and the skirt was loosely hanging around her knees. Kate was doing the buttons up and looking at herself in the mirror, she paused and asked, "What do you think, one or two buttons open?"
"Two." I said without even thinking.
"I knew you would say that." Kate put on some sandals and a denim jacket, kissed me on the cheek an went out.
I didn't have much to do for the morning, I showered, watched TV, just wasting time until the lunch date.
I walked to my Mom's office to meet her. I was a few minutes early so I waited while she finished up. I watched her and without Kate distracting me I admired her. The dark shape of her bra just visible through her blouse, her tight pencil skirt stopped just above her knees and held a very shapely ass. Her long nylon covered legs and black stilettos. I wondered if she was wearing stockings or pantyhose, maybe she was wearing a thong like the one I came in.
"I'm done now, lets get going." Mom said. Shaking off my daydream we headed to the cafe for lunch. Kate arrived just after us. It was a very normal lunch, we chatted about little things. Mom was fussing over not seeing Kate enough and when her next visit would be. After lunch Mom gave Kate a big goodbye hug and kissed her cheek, kiss my cheek and went back to work.