You try to help her without her knowing

Determined to stake your claim you reach out, grabbing Jacob's dick above her hand. Jacob stiffens, drawing a throaty chuckle from Lindsay as she assumes it's from her ministrations.

"Like that?" she asks, drawing her hand all the way up to the head of his dick.

As her hand approaches your you release your hold and move your other hand to the base of his dick below her fingers.

Lindsay slowly pumps his dick into full hardness, her slow motions making it easy for you to place your hands on him above or below hers without her ever feeling you there. The table cloth being translucent and her arm lifting it enough to let in some light lets you see her fingers.

Still, as her pace picks up it becomes harder to avoid her and give Jacob your share of the ministrations. Determined to outdo her you place your lips on the head of his dick and alternate between licking and sucking.

"Damn, I can feel your pre-cum," Lindsay drawls as you back away and her hand moves over the head you'd just been licking.

Strangely, even though you know you should be pissed about another girl invading your territory the game of not being detected by Lindsay begins to arouse you. Maybe it's not just not being caught by your boyfriend that has aroused you all this time, maybe it's not being caught doing something you shouldn't be doing?

Shoving the thought aside you set about being more daring. While her hand rubs the head of his dick you grab his balls and lick the shaft. When she moves her hand down again you attack the head.

At some point you find yourself working with only one hand, your other having migrated to your pussy where you slip one and then two fingers inside yourself, fucking your own hungry pussy as a strange arousal sets in.

Before long poor Jacob starts shaking from the joint ****, his body shaking and his dick starting to pulse beneath the hands and mouth attacking it. As the moment of triumph arrives Lindsay pumps his shaft furiously, from head nearly to the base. Without room to work you grab both balls like you're milking him and try to position your open mouth at the head, your tongue teasing his piss-slit while her hand pumps him.

With a pained groan Jacob starts to cum. Lindsay's wild pumping makes his dick flail from side to side, and much as you try to keep your mouth in front of it you wind up with one thick stream of hot cum landing in your mouth while others land in your hair, on your nose, and across your cheeks before hitting your mouth again.

Balls drained, you suck the head of his dick into you mouth and use his dick like a straw to get the last remnants of semen within. You're so focussed that you forget to avoid Lindsay's hand and her fingers rub along your lips as she pulls her hand away.

For a moment you freeze, afraid that you've been caught, but instead she just laughs a little.

"Mmm, wasn't that nice?" she purrs to Jacob, and you take the moment to squeeze his balls a couple of times to see if it brings out more cum, and then pump his shaft to help extract the lingering cum. Finally you stuff his softened dick back into his pants while he regains his breath.

"Y-yeah. Uh, I think I'm just going to, uh, clean up," he tells her, or you, and pushes away from the table.

It takes you a moment to realize that Lindsay hasn't moved, and both heart and pussy seem to throb double-time as you wonder if she might have detected you. The squelching of your fingers pumping your pussy sound thunderous to your ears as you wait for her to leave.