Too weird?

"Mmmm..." you utter as she kisses you again. She's holding you close: her breasts pressed into your side, arms crossed protectively around you. Her soft, yielding lips press with increasing urgency against yours. You can taste the salt of your tears on her skin. There is a flicker of tongue and then she pulls away.

You stare into her eyes for a long time.

"Um..." you say, dumbfounded by your sister's kiss, tender yet with bridled lust beneath.

"How about it honey?" She is trying not to growl with desire, and it creeps in between the syllables.

"But, you're my sister..."

"And you're mine. My beautiful little sister. My beautiful little pregnant sister. Who's **** and needs protecting from big bad boys like Fuckhead Alex... Who used to be my brother, who spied on me naked when we were teenagers..." You can tell that she is struggling not to put pressure on you. You get the feeling that it's only your lack of obvious willing so far that has left you both still fully clothed. "Do you not fancy me anymore? It's a new feeling for me, I have to admit. When you still had a cock it wouldn't even have crossed my mind that we might fuck, but since you've been a girl... You're so hot, you know that?"

"I thought... you were straight, Gwen."

"I was. Am. ... Was. Since I left Andy I've tried getting off with guys and... nothing's happened. It just doesn't work for me, but I hadn't even considered that I might be gay until I saw your delightful new body." She kisses you deeply, again with that flicker of tongue. You whimper in confusion. Your lips part.

"But Gwen... I." Gulp. "You have always been there for me. I love you completely. And the last 24 hours... I couldn't have done it without you. And jesus, yes. I fancied you when I was a guy... but, I think..."