Mary looked over the note and found that it said
"Experiment-3999: the Agefly: the Agefly is a apecially manipulated butterfly which can control its own age. This butterfly can be at any moment of life cycle. For example, it can grow from caterpillar to mature butterfly just in a minute, vice versa. It also can be pupa or egg state. This change of its age seems to be due to its own thoughts"
"Changing age... Is this still works on me?" Mary said. "Due to its thoughts.... then the only thing I should to do is just trying to change my age? So... I can get younger by only wanting it?" Following her mind goes, she was thinking of getting younger, almost unconscious of her. Suddenly, she started to age in reversed direction. She didn't noticed it at first, but she couldn't ignore it when her body is starting to warped to be a pupa. Mary felt something weird. As she suddenly looked down, she saw that her body was wrapped in something from below, anchored to the floor. "What is thi----- mmf---" Her words were cut off as it warps her head. In this pupa state, her body got liquidfied in a moment and reformed to larva from. Only tens of seconds later, the pupa surrounding her disappears and she found her age regration completed.
She looked down her body, which has crawling butterfly caterpillar lower body now, also only about 2 and half onches tall. "So... it proved to be working" She also noticed it works not only on her butterfly part, but also on her human part, considering how her voice hears like a kid. Also she could see her breasts are now flat, as her clothes were gone when she was being a pupa. "I think I should not wear something during this" She thought.
Judging by her reflection in the nearby aquarium glass, she now had the upper body of a little girl, about 5 years old, and the lower body of a butterfly caterpillar. "Now I can alter my age...." said Mary, in amaze, watching her young reflection. "This means I can be much mature, right?" As soon as she thought of those words and herself as a fully matured butterfly girl, the transformation began immediately. As she expected the cahnge this time, she accepted the sudden pupa stage naturally. Coming out of the puapa state soon after, she passed the previous 18-year-old from and gradually grew up to an age that looked like she was in her 30s. For now, she looked quiet hot. Breasts groen up to C cups were fully showing themselves, and her sexy mature body line was outstanding as nude.
"This is... realy cool! But... should I have to turn back? Can I be this age after unfuse? Or... just have some fun with this?"