Her panties

Kate slid a finger down the crack of her ass, teasing her tight little asshole, and I couldn't take it any more. I yanked her panties away from my face and covered my cock just in time for my balls to explode.

My wife rubbed her asshole and smiled at me as I continued jerking, milking every last drop out of my cock. By the time I was spent, my knees were weak.

"That was fucking hot," she said as she slid the tip of her index finger into her asshole. "Is it always so hot when you jack off, or is it only that hot when you want to lick my asshole? I'd like to find out what's got you so turned on."

In my mind I saw her watching as my brother jerked off in her panties. I was pretty sure she didn't want to find out the truth.

"All I know is that you are fucking smoking hot," I said as she played with her ass.

"Then get over here and eat my ass while I get myself off," she said. "You said you wanted to watch me touch myself...you didn't say you didn't want to watch from up close."