Slip two fingers inside of her

I slowly slide two fingers into her slit. I can feel her try to sit still, and I can hear her moan softly.

I start watching the movie while fingering her in case Jane looks over. While watching the movie, I feel take my cock out of my boxers, and she starts stroking it slowly. I don't mind though, as a dry handjob would've been uncomfortable.

I start to finger her faster, and I make sure I'm rubbing against her g-spot. She grabs my arm with her free hand, and I feel it tighten around my wrist as I finger her.

She tilts her head back and tries to hold her moan in, as to not let my sister hear it. I begin sliding my fingers in and out of her faster, and I feel her grip tighten around my arm. She lets go of my hard cock to cover mouth with her hand to muffle the moaning.

My sister hasn't even looked over at us, and she's totally unaware that I'm fingering one of her best friends right next to her. I start to rub her g-spot harder, and she's twitching from trying to stay quiet and hide her pleasure.

I keep doing what I'm doing, when suddenly, my sister looks over at us.

"Everything alright, Amy?" she asks, looking worried.

"Yeah... I'm fine." Amy responds, trying to act like I'm not fingering her.

"You sure? You're not acting normal." Jane asks.

"Yeah. I feel go-good." Amy replies, stuttering because I started sliding my fingers in and out of her while my sister was talking to her.

"Well, alright then." my sister says, as she turns back to watch the movie.

Amy hits me on my arm and tries to look mad, before cracking a smile and laughing a little bit.

I keep fingering her and she tilts her head back and moans softly again. I start fingering her faster, and I can feel her body shaking and I can see that she's covered her mouth again.