Hot Summer Job/Make her grip you in kind
Now that she's holding your hand up to her most private of places, Kylie has all but completely frozen in place. Slow cautious breaths are about the only thing proving that she isn't just some teen-sized Barbie doll. That and the impressive heat between her legs. But that's it. She's holding your hand tightly in place with no attempt of anything further. It's as if she thought this was a great idea right up until she went through with it and now isn't sure what to do.
You can help her with that part. The very least that she can do is reciprocate.
Reaching down, you pry her hand off of yours. Her slim thighs squeeze together as you pull her away, some combination of nervous and horny.
"Here," you whisper. "Hold this."
Crossing her arm over yours, you plop her hand down into the lap of your jeans. It takes a moment for you to position her blue fingernails and their accompanying digits around the stiff cock running down the inside of your pant leg, but once you do you squeeze the backs of her nails and force her to grip your needy erection.
Now you're the one holding her in place. She looks down into your lap and then, seemingly embarrassed, averts her eyes and refocuses on the movie. Of course she can't look forward for very long without glancing down at the obliviously bared pussy of your little sister, what started all of this in the first place.
You squeeze her hand again. Immediately afterward you press against her pussy mound. You reinforce this a few times, squeezing and pressing, silently demonstrating how this should work. Then you let go. The simple fact that she doesn't pull her hand away is encouraging, but her fingers are mostly limp, only lightly draped over the long bulge in your pant leg. You sit together quietly, hands tucked into inappropriate places, while your respective sisters are only a few feet away.
After a minute of stillness, the first voluntary squeeze through your jeans is shocking. It takes you a few seconds before you remember the arrangement and press your fingertips against her shorts. Her soft little mound has more give behind it than you ever would have thought after seeing it yesterday, right up until it tries to part to let the fabric pass between her lips. Emphasis on try since her tightly sandwiched legs are doing everything in their power to keep everything closed up.
A few more seconds. Another squeeze. Then another. Kylie grabs your forearm with her free hand. You strictly reciprocate and she quickly takes the hint. She strokes you a little. You brush up and down her pussy. She starts playing with your glans, barely detecting the ridge of your head through your pants, so you start teasing her clit, lightly clawing at the top of her slit with your fingertips.
Unfortunately you only get a couple minutes of playful exploration before you're interrupted.
"Are you two cuddling?"
You and Kylie were so absorbed by your mutual groping that you didn't notice either of the girls turn around. But the question confuses you at first until you realize how you and Kylie must look to them, sitting together on the couch, Kylie leaning into you, holding your arm.
"Riley and Kylie, sittin' in a tree, K - I - S - S - I - N - G!"
Larissa started the song, but Bree was quick to join in, harmoniously teasing the older kids behind them.
"We aren't kissing," you state flatly, your hand still tucked between Kylie's thighs.
Larissa giggles and grabs Bree giddily. "Are you boyfriend and girlfriend now?" Your sister asks mockingly but with a tinge of worry.
"What if we were?" Kylie shoots back sassily. That's not likely to help.
You try to counter the immature taunting. "Do we look like we're kissing?"
Bree looks you both up and down. "Yes."
"Liar liar pants on fire!" chimes Larissa.