You should relax about any weirdness in dreams. You can't possibly help what you dream about. And you're dreaming what you have to dream at any given time. The mind is always right! So just trust it

Everything in dreams is disguised, so when you dream about sex, you're also dreaming about other things. I've often dreamed about sex with people who were inappropriate for me in real life. Often, for me, dreaming about sex with someone can mean that I'm trying to communicate with them, to achieve intimacy (as wepow said), to bridge distance, etc. I've had dreams where I was having sex with my parents. My relationship with them was pretty terrible, and I believed those images evinced a kind of crazy desire in me to reach them in a fundamental way...

Sex can also have echoes of life-giving energy, etc. Just play with it and see what you come up with, in relation to what you're consciously aware of in your feelings toward your T. I would mention this dream to her, also, BTW!