If a man thinks you really want to give him oral sex and that you really like it, that is generally a huge turn on. Making little comments throughout that day, "I can't wait till we get home so I can ..."

Some men are really turned on when you swallow and others don't really care.

Doing a bit of "foreplay" is generally appreciated. Here are a few suggestions:
*Kiss your way up or down to his penis. Kiss your way from his lips or start with a foot rub and kiss your way up his legs.

*Kiss/lick his inner thighs and balls.

*Touch and kiss the perineum (area between scrotum and anus).

Some tips for the main event:
*Lick the length and include balls.

*Swirl tongue around tip.

*Put hand around shaft and move it up and down with your mouth. This is especially good if you are not able to take it all in your mouth. A variation would be to twist your hand while going up and down.

*Vary speed between very slow and fast.

*Take it in really slowly and hold it in your mouth. While it is in your mouth, swirl your tongue around it.

*Use hand to caress/play with balls.

One caution about ben12's suggestion - not everyone is into anal play. It may be a nice surprise or a terrible mood killer.

ben12's suggestion of a sinus pill is a good one. During allergy season, I will change positions so that my head is not down. Kneeling while he is standing or sitting may help. If you have a door or fantasy swing you can sit in a chair and have him in the swing.

Communication is the key. Try something new and ask if he likes it. Incorporate and switch up what you do.