How about a penis?

He had to guiltily admit that he had a thing for transexual porn and even more so for hentai girls with dicks. As he sat smiling to himself at the idea he mused about how he wanted it to go. It wasn't as straight forward as "I wish she had a penis" the variables were too great. What kind of penis? A tiny little fem boy dicklet, a long and thick shlong or just an average cock? To keep the pussy and be a futanari? Has she always had a dick and if so what would that do to their history together? If she grew a penis how would he stop her dashing off to the hospital about it?

Tom sat there and pulled out his stiffening cock and mulled it over using his arousal to guide where he wanted it to go.