I slept with Joanne, who had a dark secret

What is the weirdest sex I have had, I thought about is for all of thirty seconds, the night Joanne slipped inside me, on a fucked stopover.
Now before you cry Lesbian or Bi-Sexual, you would be wrong, because Joanne was neither, she was a transsexual, something I did not know at the time, nor was she, him about to admit to, especially since I had offered to share my hotel room and not leave her stranded without.
We both worked for the same airline, which I shall not mention, due to legal obligations, but I knew Joanne from our first meeting her on a photo shoot, which was an advertisement and charity page in our airline flight magazine.
I found her to be strangely alluring, very charming, and extremely beautiful, with a flawless and a peachiness, to her skin.
She was a girl who had both a huge fan base and was very popular amongst the stewardesses, but not the men, we all wondered about her sexuality, believing she was a full blown Lesbian.
On the night in question she approached me and asked to share with me. I readily accepted, but chose to broach the subject of her sexuality later in the room, especially when we entered and were confronted by a double bed.

Joanne laughed off my concerns, swearing nothing could be further from the truth, she definitely was neither lesbian or Bi.
We drank to that, cracking open our wine duty-free, and before long we chatted as old friends, reciting some ribald times with passengers, in similar situations as tonight, somehow I was glad to hear she had been with men, but something in me was excited about her, I could not put my finger on it, but when she took her top and brassiere off, I gasped at the perfection of her nude breasts.
She smiled before adding, 'Hey Mariel, do I need protection from you', point taken, I laughed, but I really did admire them, and she walked around bare breasted for the remainder of the evening.

By the time we called it a nigh it had gone past two in the morning, and I stripped off nude, now it was Joanne's turn to compliment me, but sparingly, as she showed restraint, for fear of arousing my suspicions again, I was totally nude and admit to flaunting myself in front of her, putting it down to wine consumption.