Family Ties/Play with her pussy.
Moving one of your hands underneath the table and in between Heather's legs, you rubbed her pussy through the thin material. Your older sister let out a gasp, one that thankfully no one noticed, and gave you lustful look out of the corner of her eyes. You pulled aside her panties and quickly inserted a finger into her, enjoying the heat that her pussy brought to your cold finger. Soon you were pumping two fingers into her while making sure to eat so that your family doesn't notice anything odd.
Heather's face had a slight blush and her breathing quicken everytime your fingers moved in and out of her. Her hands were slightly shaking as they brought food to her mouth and you didn't miss how her nipples were beginning to poke through her shirt.
You cast a quick look at your family and saw that they were still preoccupied with their own things. Mom was reading the newspaper now while Jessie and Jacob were still focusing on eating. You idly wonder where your father was but brushed the thought away, keeping up the effort of fingering Heather as her pussy grew wetter. She was softly panting now and her blush was entirely visible. She was discreetly grinding her pussy against your hand, trying to make as little noise as possible.
Suddenly your father entered the kitchen, dressed and ready to go. "Alright Jessie, Jacob and Timmy's things are already in the RV. Honey, you and Heather should finish your packing now."
"S-sure dad," Heather said while forcing her voice to stay level. "Is it alright if Timmy gave me a hand?"
"Okay but don't take too long. We need to beat the traffic."
Heather nodded, finishing the last of her cereal as you enjoyed fingering her a bit more before moving your hand away. The two of you made your way upstairs and into her room, with Heather closing it once you came in.
Before you knew it, Heather picked you up and threw you on the bed. You quickly sat back up to see Heather standing right before you, arms crossed and an amused look on her face.
"Timmy you bold little perv, do you know how much trouble we could have gotten in if we were caught," She asked and then pointed at her wet panties. "And look at how wet you made me! We're lucky that I didn't moan or anything."
You smiled at her. "But you wanted it. You sat next to me wearing nothing but that and even spread your legs open to let me see your pussy."
Heather rolled her eyes. "I was giving you a show but I guess that backfired. Fuck you made me really horny now but we don't have enough time for even a quickie." That dampen your hopes for a quick fuck but you don't let it stop you entirely.
"Maybe something else?" You asked and Heather gave you a smile.
"Oh? What does my adorable little brother want to me to do?"