Teacher and student fantasies are very common. Take turns playing the student and the teacher. This is a tension-building teasing game, and allows for a lot of role-playing possibilities, e.g. 'punishing' each other.
When most men think of a threesome, they imagine it involving themselves and two women. Many women also fantasize about having a threesome, but they think of it differently. Women think of a threesome with their male partner, and a female partner as well, but they also think of having a threesome with two men. This may not be the most desirable scenario for a heterosexual male, but you may be surprised at your own enjoyment. And, who knows? By being open to a threesome with another male, your female partner may be more open to having a threesome with another female.
With a Stranger
Having sex with a stranger is dangerous and exciting. Not knowing how kinky or strange that it may be can add an adrenaline kick to the sex. This is a great role-playing game. You an your partner can meet in public, and pretend to be strangers. Although you already know one another, the role-playing side of this fantasy will surprise you at how much it adds to the excitement.
She Likes to Watch
Most people like to watch sex, whether it be a video, or the live act. Your female partner is no different! To act out this fantasy with your partner, simultaneous masturbation is a great starter. Also, if you decide to have a threesome, you can take turns being the voyeur.
The power play involved in domination and submission can add excitement as you take turns being in control of one another. Domination could be anything from tying up your partner, blindfolding them, making your partner wait for orgasm, or simply telling your partner what to do and when to do it.
Men love lapdances, and so do many women. Unfortunately, most men do not dance for their partners. To really get her worked up, and to truly show her what you are willing to do for her, surprise her with a sexy striptease. She will be through-the-roof with excitement!