Your hand in her pants

You slide your hand up her legs. Her jeans are unbelted, so you find it easy to push your fingers past the waistband and down into her panties.

Salja giggles quietly.

"What?" Ashley says.

You feel lucky that it's so dark in the back seat. With the windows tinted and the divider down, the three of you are sitting in almost total darkness. That gives you something to work with.

You put your hand over Salja's mouth, which tells her to be quiet and smothers any sounds she might make. The other hand is hard at work, rubbing her clit slowly but with purpose.

Salja breathes heavily against your palm. Without your hand there, Ashley would definitely hear her, definitely notice what's happening. But she doesn't. The woman to your left, it seems, is completely unaware.

As you keep rubbing Salja, her breathing becomes even more ragged. She clamps her mouth shut, **** not to make any noise at all.

It seems like what you're doing is working, as your friend is suddenly very wet. You decide that it's time.