By bluntly telling her the truth

I never had hidden my needs from my sister, I tried when in adolesence... with little success, so my reply was brazen faced:

"I want her"

My sis was now smirking like a chesire cat she could read me like an open book.

"You want Cat?"

She replied teasingly, oh how I hated her for little games like that.

"I could spear her on my manhood right now..." and both we knew that this was only partly meant sarcastically.

My sister being my sister could well imagine the bulge beneath the table without looking.

"Uh, so bad?" she said with a smirk yet still some compassion

"Stopp that nonsense and tell me about her..." I demanded my sis to stop.

"Ok, ok..." she ordered some dessert for us.

"This will take a while..."

And then she started to fill me in on Cathryn, her relationship to her... man I was reliefed to find that she was not my sis´s best friend otherwise I could have burried my plans to screw her for good.. and of course Cat´s marriage...