Sarah watching the rat that used to her sister Lisa cleaning cum off her fur told Eric "I want to start my slow transformation into a lizard." Eric caught off guard by that looked at Sarah with a shocked "What?" Sarah explained "I've had a thing for lizard since I was young. I love lizards. And seeing Liza as a rat creature & descending completely into a stupid feral rat has caused me to reach my decision. I want to slowly transform into a lizard kinda like how Lisa slowly became the rat she is now." Eric processing all of what Sarah had said asked "You sure about this?" Sarah nodded "Yes. I want to slowly transform into a lizard. I want all changes to be permanent & I want to ultimately be thought of nothing but an animal. I also of course want ultimately experience the mental degradation like Lisa had as she became more and more animal and less human." Eric thought about this & soon became fascinated by this. Eric kinda wanted to see this. Eric got & walked over to the computer. Eric booted up the program & then asked curious "You want to do your transformation just like Lisa's? Through tainted cum?" Sarah asked wondering "As you fucking me more & more into a lizard?" Eric nodded "Yes. But with a reptilian penis." "Absolutely." Sarah answered loving the idea. Eric typed in the changes to himself. To have a reptilian penis & balls with tainted transformative reptilian cum. Eric hit enter & then told Sarah "In a few minutes my penis & balls will become reptilian. My balls will then fill with transformative reptilian cum. And after that we can fuck and once I cum in you there is no going back. My cum will start the process of transforming you into a lizard. The more cum you get from me the more your body will shift from human to lizard. It will work just it did with Lisa." Sarah very happy said "That's great." Eric with a smile said as he felt his junk about to change "And I will leave you to figure out what lizard you are turning into Sarah." That sounded kinda fun to Sarah.