I closed my eyes again and wondered how long it would take for him to be content. Then I felt warm wetness over one nipple and my eyes flew open.

He'd taken my nipple in his mouth and he was sucking on it. I couldn't believe it. My own brother was sucking my nipple. It was wrong on so many levels. And yet it did feel pretty good.

"Tristan, what are you doing?" I demanded.

"Sucking on your tit," he said, his voice muffled by my boob.

"I can see that," I said. "This is so wrong."

He didn't say anything, he just had a big goofy grin on his...