(This story continues to develop the relationship between Nate and his sister Shelly that was introduced in Part 1)
The next day was Mom's day off, so Shelly and I needed to behave, but apparently, Shelly was still intent on being a tease. The day was forecast to be warm and sunny, and over breakfast Shelly suggested to Mom that it would be a great day for sunbathing on the back deck. Mom liked the idea of getting out in the warm sun and relaxing. I said I was going to play video games, but would check in on them occasionally and play bartender if they needed a drink at any point.
About an hour later, I was in my room on the computer when Shelly walked by and said she was headed out to the deck. She was wearing one of the most revealing suits I had ever seen her in. It was a red string bikini with a Brazilian scrunch back that she chould essentially turn into a thong if she wanted. The top had ties in back and around her neck, and the triangles covering her breasts were about two sizes too small, leaving most of her breasts exposed.
"Wow, that's an incredibly hot bikini Shel."
"Thanks! I got it a few weeks ago. I wanted a minimal suit for tanning."
"Well, not much more minimal than that unless it was a thong or G-string."
"I thought about it, but figured Mom might have an issue with a thong. And at the time, I wanted to be just a little discreet around you. I guess I don't have to worry so much about that now," Shelly said with a devious smile.
"Well, when Mom's not around, you can wear as little as you like."
"Maybe in the morning, when Mom's gone, I'll surprise you."
"Well, you did say you like to lounge around your dorm room in the nude."
"So you'd like me to lounge around the house nude too?"
"I certainly wouldn't mind."
"Well, if I do, I'd expect you to also."
"I wouldn't have a problem with that."
Shelly seductively licked her lips, then waved goodbye and headed downstairs without another word.
A couple of hours later, after finally making it to the next level of my game, I took a break and headed downstairs. I grabbed a Coke from the fridge and walked over to the sliding glass door to see if Mom and Shelly were outside sunbathing. They were both laying on their stomachs on chaise loungers in the middle of the deck, their bikini tops untied. Shelly had scrunched her bikini bottom to make it essentially a thong, her round ass shiny from the tanning oil. I opened the sliding door and asked if either of them wanted anything to drink. Shelly suggested a pitcher of frozen margaritas and looked at Mom with a pleading expression, hoping she would agree.
"I don't see why not. Sure, one pitcher of margaritas please."
Shelly smiled brightly and I went back inside to make them. While I was in the kitchen, I also made a few sandwiches and took the pitcher, minus a maragarita, out to them. They thanked me and I told them I was going to head back upstairs to start the next level.
I became totally engrossed in the game and didn't realize it was already the middle of the afternoon when I heard someone coming up the stairs. I turned to the door as Shelly appeared. She walked over to where I was sitting to see what I was playing.
"We've gotten enough sun for the day. Mom went to her bedroom to take a shower. I'm headed to do the same."
"Too bad I can't join you," I said with a wicked expression.
"I know. I've been wound up all day. If it wasn't for sweating, I'm sure Mom would have seen a large wet spot on my bikini bottoms."
"Was that from thinking about me, Sis?"
"What do you think? And don't tell me you haven't had similar thoughts."
"Why do you think I've been so focused on this game? It's the only thing keeping my mind off you. And that swimsuit doesn't help at all."
