Have a nice bubble bath ready for her...and wash her body with soapy hands, gently massaging her pussy and sliding a finger or two inbetween her lips a few times. Towel her off and lay her down. Spread her legs and give a few nibbling kisses on her inner thighs as you slowly work your way closer to her pussy. Take your tongue and trace the outline of her outer lips a few times, then just go for the middle, slow up and down licking. You can use the underside of your tongue as you slide down. Gently part her lips with your fingers and give some delicate stroking of her inner labia with your tongue, one side, then the other, back and forth, then trace around her clit in circles. Take the clit between your lips and gently suck it into your lips and let it slide back out a few times. Give her a few quick flicks on her clit and then slow it back down to licking from her clit, down to her pussy and back up. Then speed up your tongue sliding, up down, up down, then finally focussing on her clit alone, giving it your wide flat tongue with faster licking up and down. Then making the tongue stiffer and stronger stroking of her swollen clit until she's moaning and quivering and couldn't hold back her orgasm even if the house was on fire.