Try to convince her it's ok.

"Oh, sorry Jane. It's just, you're being so generous with what you're paying me today, that I thought it was only fair that I made sure I didn't miss any spots on you today." you say, slipping your finger another inch inside her, a shiver working across her back as you do so. "I know how hard you work" you tell her in a soft, calming voice, all the while, moving your finger in and out of her dampening hole. "Taking care of the kids, managing the household... Your needs always have to take a back seat, don't they? This is the one day you actually have to yourself, to reward yourself for all your work that goes unappreciated, so just relax Jane, and let me massage you."

Your comments must be something she's thought to herself at one point or another and given her a valid enough reason to lower her inhibitions, because she begins to lift her hips and spread her legs in response. Her new position allows you to slip a second finger in and more deeply penetrate her tunnel.

It isn't long before her juices begin flow, coating your fingers with her natural lubricant, and her breathing starts to quicken. Quiet moans of pleasure start to escape her lips, muffled from her burying her face into the padded massage table. You quicken your pace, rapidly working your fingers in and out of her slick sheath, causing wet, squelching sounds to fill the air.

She's completely given up her resistance by this point, focusing only on the sensation between her legs and the thought that she does deserve this. That right this minute, she doesn't need to worry about anyone or anything else, just the feeling of her young, hot massage therapist finger-fucking her twat. She finally let's go in a way she hasn't let herself do in years and begins to tremble uncontrollably as her orgasm tears across her body. Biting down into the mattress to keep from screaming out, her hands claw into the sheets, and ass arches into the air as wave after wave of electricity courses through her body.

Watching the effect you're having on her, you continue working her wet, needy, depths until her spasms begin to subside, then slip your fingers from her soft fleshy insides, wiping them clean on the sheet of the massage table. You take in the site of Jane's body sprawled on the table, still breathing heavy but otherwise limp from the orgasm she had moments ago. Her legs are spread, exposing her glistening, slightly parted, pussy lips and making you hunger for her more. Your cock strains against your shorts, fully engorged, begging to be released, and your entire body screams at you to mount her right there, but there's a small voice in your head telling you that might not be a good idea.