A prehensile cock

When the wheel came to a halt, Samus felt a buzzing heat from between her legs, she looked down only to see an appendage similar to a penis growing and elongating from her crotch, and all the while, Samus is moaning and panting from the process, it kept growing until it's nearly the length of her legs. When the changes are done, Samus tried standing up and realized than her cock is a prehensile limb, she tried holding some beakers and other things in the lab that she's in to test out her new limb, and it's surprisingly effective to say the least.