Hi Tasha,
I think I'm just starting to feel what you're talking about. 3-months postop and dilating is ever so stimulating. And there are those times at work when I have to cross my legs and hold my breath. It's not lasting hours, more like a few seconds, however.
And, my mate and I have the same relationship - she's straight and I'm female-attracted. For reasons unrelated to being trans, our sex life stopped some years back. Instead, we have practiced intimacy without sex, and that hasn't changed since my transition. But, since I've started having fun with my new body, my mate has become interested in sex again too.
Our solution is sex-toys. At the moment, we haven't actually acted on the idea, however - they're not cheap. But, I do foresee this happening soon - both of us able to pleasure ourselves together, and to experiment beyond that point.
I don't know if your mate is open to experimentation or not. I think for us, we will be able to find a way to enjoy each other's company in sexual pleasure without making sexual attraction an issue at the same time.