Cross-dressing, Trapping

Hi, eurofag here. Today my world has been rocked. I am gay and never had any feelings (physical and emotional) for women, i am as gay as can be (pure bottom btw). Anyway today i met Andrea. Everybody thought she is a lesbian or bisexual (including me). We sat together for a long time and hugged each other and well, things developed itself and suddenly we were kissing and touching each other (in a Scene-Bar, btw, imagine the weird looks of the other gays and lesbians). Well hours passed and we kept on cuddling each other. I was TOTALLY confused as i normally do not have any feelings for females, however i have had several TS in my arms already and knew they were partially male,simply by listening to my inner sensor. And NEVER had any feelings for women. Imagine my confusion!!!
I thought: OMG, after all those years i'm suddenly bisexual, wtf!?
OK, we went home to her and kissed and hugged and she told me that she is not homosexual, not heterosexual and not bisexual. Which left me a bit confused :o She then showed me a picture of a plant and said, i am not a woman neither, more something like that (and pointed to the picture).
tldr: Andrea is a transgender person. Which is perfectly fine with me, i like Andrea, nothing else matters.
However i need any help i can get from you as tomorrow we will meet again and i want to avoid any silly mistakes i could possibly make. And trust me i am excellent at making silly mistakes, so please help me: What are the DO's and DONT'S in this case?

p.s.: Thanks for pointing me to the correct board, S. :O