Return the favor

It's only fair to return the favor, you think to yourself. You reach out slowly, and slip a hand inside the hem of the conservative woman's skirt. She doesn't move, though you can see her breathing pick up a little. Encouraged, you push your hand further in, fishing around to move aside her tucked in shirt, and under the top band of her panties. Still, she has not moved to stop you, so you push your hand the rest of the way in, until your palm is cupped over her mound, your middle finger resting above her slit.

You pull her outer labia lightly aside with your forefinger and ring finger, then curl your middle finger in, slipping it inside her pussy. She is wet inside, even if she wasn't dripping it all over herself. The woman shudders, and leans back a little further, tilting her hips to give you a slightly better angle, her eyes closed. You withdraw your finger, then rub the extracted juices around her outer pussy lips before pushing it back in.

This time, you roll your finger around in her, spreading her out a little, knuckling in your middle finger as deep as you can from your angle. You work up a bit more lube, then slip in your forefinger at the same time. Once both fingers are coated, you remove them, and begin to rub her clit.

You start off very light, just spreading her juices in its general vicinity, but quickly move to a quicker rubbing pace. You brush your fingertips across her clit, and the woman's back involuntarily arches, accentuating a nice pair of breasts underneath her otherwise unrevealing blouse. You keep diddling her clit, occasionally taking a second or two off to replenish the juices covering your fingers by slipping them into her now watering pussy. The woman struggles to keep her breath under control, but even so, you can hear the subtle change as she comes, her breath catching in her throat as her clit throbs underneath your quickly twitching touch. You keep stimulating her until she yanks your hand out from under her skirt.

Just at that moment the train pulls up to a stop, and you see a handful of people outside who will almost certainly be boarding. You nudge the woman next to you with her elbow as you tuck your own sex organ back into your clothing, and she sits up and tucks her shirt back in to her skirt. The doors open, and as the three people outside step onto the train, the woman says to you ...