Setting the mood can be construed differently by person to person. Some enjoy a smooth walk on the beach at sunset, a great time at diner with intellectual conversation, or even the extravagant over the top flying on a private jet to Paris for lunch. What ever your mood setter is you have to do it with thought and care because things might not go your way.
For me I like to set the mood by lighting some candles, turning on some smooth slow jams like a classic Luther Vandross or Gerald Levert, massage oils, and some fruit, crackers, cheese and wine. Put a lil deep Billy D base in my voice "Hey baby, come on over here and let daddy work on you because you had a long day" undress her slow and provide gentle kisses up and down her spine lay her down across the bed and begin working my magic by caressing every inch of her body. Slowly feeding her in between her massage. And well you know what happens when you get a bursting sensation in your mouth, its an aphrodisiac, and some slow songs after you worked her body over with the strength of your finger tips.
All I am saying is it doesn't have to be expensive or seem corny as long as you put some thought into it and take your time. She will be so grateful and she might even ask you for another "Refill!"