The wish works (unintended consequences).

Tom opened his eyes, his lovely wife laying in the bed looking sexy with no penis. He smiled out of relief and walked closer to her, laying his hand on her thigh.

She moaned appreciatively, bucking her hips a little. She licked her lips and smiled, "I'm so horny!" She bit her lip as Tom looked up at her. He looked back at her crotch carefully, just making sure. Through the lace, he could see some kind of swelling at the top of her pussy, where the penis had previously been.

He looked more closely, "What's the swelling?", he asked.

She rolled her eyes. "You don't remember? The doctor in Thailand left the stump after the sex change! You were there!", she bit her lip and looked seductively at him, "You know how sensitive it is!"

He gulped and thought. Oh yeah. Another set of memories began to form in his brain. He could remember taking his Hermaphrodite girlfriend to Thailand and getting her cock cut off.

'Fuck." muttered Tom again.