Disclaimer I Do not Own Phineas and Ferb or any of the characters in this story all I came up was the idea for this story. They belong to disney
Chapter 2
At Doofenshmirtz Evil Incorporated Agent P crashed through Heinz's door and right into a trap, a cage shaped like a pair of balls. "Ah Perry the platypus how "ballsy" of you to show up, get it because your trapped in a pair of balls ha ha ha!" badly joked Dr. Doofenshmirtz. Perry rolled his eyes, "Eh well anyway I suppose you noticed I have been purchasing much of the towns aphrodisiacs (chocolates, strawberries, wine, etc.) "Well you see Perry the platypus I have been watching a lot of pornographic content and I have realized that sex is very distracting so I invented this." He shouted as he pulled the tarp off of a large object in the middle of the room, revealing a large cannon like device with a pair of lips on the front and a chute on the back for ingredients. "I call it my Sexinator, one hit by its beam and the target will be overwhelmed by an uncontrollable lust for sex." Explained Dr. Doof, as Perry began looking around at the cage and realized that his tail was still free enough to undo the latch in the back of the cage. Dr. Doof continued "By shooting the mayor's office and the surrounding area, they will be so distracted having sex that I will be able to waltz right in and take over the tri-state area, and made it so it only affects people 18 or older so my daughter will not be affected if she is in the area. Bwhahahah"
Back at Phineas and Ferb's house Isabella was walking into the backyard, "hey Phineas, what cha doooin'?" She asked in her usual manner. "Hi Isabella, we are going to go see a R rated movie." Phineas replied "Um Phineas aren't we a little young to go to a R rated movie?" "Yes, Yes we are, that's why we made a device to make us older." Phineas explained as he showed her a device that looked like a ray gun with a meter on each side. "Oh ok cool then can I come too?" "Of course. We are just about to test it now" Phineas replied. Vanessa walked out into the yard overhearing the conversation. "Make you older? How? " She asked. "Well first you turn the dial on the left to the age you want, I will put it at 18," He turned the dial on the left "then you set the amount of time on the right," He set the right dial to 3 minutes, "then you shoot." He shot Ferb with the beam, Ferb shot upward until he was about 6'2, and his face began to look more masculine. He grew light sideburns and his chest was now rippled with muscles, his shirt and pants grew enough to keep him covered but just barely concealing his now adult manhood. Vanessa's jaw dropped not only had she not expected the device to work but she definitely had not expected Ferb to turn out so good looking as an adult. Ferb began speaking in a much deeper voice then he used to, explaining how it worked, but Vanessa was distracted both by his new body and what she could make out in his pants. "… and that is how it worked" is all she caught. Then exactly 3 minutes after he was shot with the beam Ferb turned back to normal. "The timer is a failsafe so we can still turn back if our invention disappears like it usually does" said Ferb intelligently. "So with this we can all go see the movie?" Vanessa asked, "Yeah that's the plan" said Phineas "Then what are we waiting for fire it up so we can go." "Sure." Phineas said as he set the dials to 8 hours at 18 years old.
Ok so there was chapter 2 tell me what you think Isabella and Phineas, (and to a lesser extent) Vanessa should look like, the transformations and probably the lemons will happen next chapter, but be warned this will be my first attempt so don't expect perfection, please read and review.