Go for the top.

You reach up and grope one of the massive breasts placed above you, to the delight of your mother, squeezing the soft flesh, through her nightie, occasionally pinching her large, erect nipples, poking through.

She runs her hand through your hair, as you fondle her, rubbing her tanned thighs together, clearly extremely aroused by all that's happened.

Lovingly, you kiss her side, working your way up to the second titanic mound on her chest. Gasps escape her lips, as she feels your lips on her warm skin. Her breathing increases rapidly as you close in on her nipple, as you lengthen your kisses the closer you get.

Just before you plant your lips on her erect nipple, she places a hand over your lips, stopping you. With a slight giggle, she reaches over you and turns off the floor lamp, which was lighting the room.

While it was dark, you could still make out the outline of her figure as she lifted her nightie over her head, leaving herself completely naked, on top of you.

With her hand, she guides your head back to her breast, making sure you find your way back to her nipple, this time without anything to get in the way.

As soon as she felt your breath on it, she pushed her breast into your mouth, tightly holding your head against her, as you licked and sucked her teat.

"That's it, baby." She purred, softly, in your ear, "You've almost got it."