You do a regular massage with an edible oil - I prefer Olive because it washes easy and is not un-enjoyable when you move onto oral stimulation however, you cannot mix oil and condoms. Anyway make sure in your massage not to neglect her sensually responsive areas including her neck, her ears, her lips, of course her breasts and nipples, _ you almost cannot spend too much time on her nipples - most women enjoy up to 30 minutes of nipple and breast play if it is gentle, sensual, and the attitude is worshipful of her feminine charms rather then grabby pinchy, pully on these sensitive and response nipples. Never neglect to use your lips and tongue and again TAKE LOTS OF TIME HERE! by the time you leave her chest she would be a writhing and desperate woman wanting more , eager for more contact but do not make contact with her pleasure centers quite yet,
tease and pleasure, keep her on the edge of pleasure as long as you can so do her belly and coat her entire sex well with oil yet make not contact with her clitoris nor linger on her vulva then work down the legs and turn her over working up the legs and then the shoulders and back before the buttocks, Prone in her cleft and use light quick strokes on her anus - she will likely rise to meet you trying to encourage contact with her throbbing sex, but instead you lean down and use you tongue on her anus in quick darting stroke and tiny probing invasions of her tightest and most secret passage - one richly supplied with nerves and capable of increasing her arousal many times. Then turn her over and just when she thinks that you are going to finally bring her orgasm get the vibrator and work her neck and beasts and then her inner thighs and finally her sex.
Be aware that if this is a powerful vibrator like a hitachi it may be far too strong for some women so follow her guide or place a soft towel over the area and virate through it. In any case seem to avoid her clitoris as long as possible then concentrate just above it- she should reach orbit fast!
Save the G-spot of another round.