Oral sex. Just straight up. If you're looking for advice involving intercourse, too bad, because that ain't it. If you're looking specifically for techniques involved in oral sex, well, everyone is different. I know a few gals (myself included) who find that tongueing or rubbing the head of the clit is almost painful because it's too sensitive, so applying some love to the top and hood is where it's at. Or, you could be super secure, get over the jealous infantile hatred some men have for vibrators, and work her over with one. That usually does the trick.
flip her around in multiple positions... see what gets her off... Ive never given oral before, (i did once but i wont talk about that) and every gurl i been with has had a couple o's before i bust my nut...