Make a sex toy with fun side effects

You're a teenager, and you can turn people into elves and whatnot, and you can hear your sister having fun down the hallway. This sort of gives you some idea of what to do with this power.

You decide to test the magical laser pointer to improve sound insulation of your room, and within a few seconds you've turned down the volume of your sister to barely audible levels. You lock your door and begin to ponder what to create. You find some trash and gather it in a pile on your desk and pick up the laser pointer and begin thinking of options.

You think you'd like to make a little sex toy that increases pleasure and even changes its form and the user's form and life based upon the desires of the user. You don't want others to notice any changes, so you think it should make sure others don't notice any changes, but you don't want to paint yourself into a corner so you want an exception for yourself. Though, from past experience, you want to be made aware of changes, so you think you should get a mix that doesn't overwrite the memories of your previous existence.

You think that the item itself should change quickly and it should arouse persons holding it quickly, but a person shouldn't change too fast. It should take a few minutes at least. Once the user has reached climax or lets go of the item, the item should stop working on them. You also want to add a battery function to make sure it won't **** during a "session."

You click the laser at the wall to scan over what the laser has interpreted of your wishes, and it looks good from what you can see from a few breaths of reading. You point the laser at the trash on the table and see as it begins melting into a small puddle of goop, before slowly becoming white and getting a plastic sheen. The tip of a vibrator begins rising out of the fluid, drinking it up as it solidifies into what you think is a four inch nondescript vibrator.

Hmm, you'd hoped for a pocket pussy, but you guess that's something you can change at will if it works as desired. You put down the laser and reach over to pick up the new item.

Oh... Oh. Oof. Your body breaks into a sweat as you feel arousal crawling through you, pelvic muscles twitching with need and your dick beginning to grow in your pants. You breathing intensifies and you begin casually rubbing at your dick through your pants with your unoccupied hand. You unbutton your pants and accidentally touch the vibrator against your dick, sending a jolt of energy through your body. Wow. And it wasn't even turned on. You pull down your pants and fish out your dick, slowly rubbing the inactive vibrator against the tip of it. You decide to risk it and turn it on, amplifying the sensations twofold. You gasp loudly and just leave it rubbing on your dick. It feels way too nice for just being a piece of vibrating plastic, but you love it.

You recollect the secondary effect and panic momentarily. Have you thought of anything? What should you think of? You're probably running out of time, so you better think of something fast!