Viennese Oyster Sex Position requires the girl to be flexible enough to perform this. She will have to lay on her back and pull up her legs until her ankles are near her head. You can fully enter her as this position will expose her very private parts. From this position you must use your arms to support your weight while you are going in and out on her.
You can also use your shoulder to let her ankles rest and use your arms to squeeze her legs inward. This will create more friction and can be satisfying for both of you. This is perfect if you want to enjoy kissing while you keep on pounding her. You can also suck on her breast or let her nibble yours instead if you wish.