Lucius gazed at the youth's appearance, gaze stuck on the youth's pair of rosy lips that were opening and closing, and couldn't help but want to give them a taste.
Intersex is what you mean, people in the community of having both male and female parts find it offensive to be considered trans. As they aren't trans people, but intersex people.
Warning NSFW! (Please mind the warnings) Moulin is 'somewhat' like a trans person. I will be using slightly feminizing words for body parts. Please be warned. If any of you find this uncomfortable, please skip the chapter. (NSFW might last more than one chapter)