A Spider-Man zentai suit on the rack filled with other superhero zentai suits. As you look closely you noticed due to your vast knowledge of the Spider-Man lore the suit is patterned after the suit that the characters Ben Reilly and Peter Parker's daughter May "Mayday" Parker wore in their respective series. Thinking of the times you wore a Spider-Man costume when you were little you smiled a bit as you figure why not have a Spider-Man suit again as an adult. You quickly grabbed it and walked into the dressing room to try it on.
After stripping yourself down to your underwear you started to slip into the suit by putting your leg inside the suit leg but as you do so you though you felt a slight tingling in your leg. Feeling nothing afterwards you shrug and continue getting into the suit. Once you've in the suit completely you looked yourself into the mirror liking what you're seeing. Suddenly the tingling that was in your leg returned but this time it's now all over your body more intense now. You hold yourself up on a chair as your body seems to be going through a massive change.
First your height shrinks from being around 6 feet tall to around 5 feet then you felt your hips growing larger with your legs being slimmer with your hair shrinking into your skin. You now feel your member shrinking inside you leaving what seems to be a slit from where your member used to be. Then your stomach loses it's fat while at the same time your breasts start to grow larger and larger. You start to moan with the surprisingly wonderful feeling with being transformed as your Adam's apple shrinks leaving you cry in a now feminine voice. Finally your face start to mold itself into a feminine shape. You gasp as your wrists feel like they've been touched by a hot iron pan making you arch your back in small pain. Collapsing on your chair you breath hard as you try to understand what's happening. You then take your mask off to breath only to leave with a special surprise.
As you look in the mirror you find out that your face is that of a woman's and quite an attractive woman at that. You look at the rest of your still in shock over your new woman body especially looking at your large breasts which you groped a bit earning a small moan from your lips. As you again look at your face you realize that you're the spitting image of May "Mayday" Parker from the Spider-Girl comic series. Any normal person in your situation would be both terrified and freaking out but somehow this feels right and it's hard to wonder why.
Curious you wonder if you got any of her powers like web shooting. Looking up to the ceiling you raise your right arm up and did the iconic web shooting pose and to your amazement you shot out a web hitting bullseye. You grabbed it and climbed up to the ceiling looking upside down growing more excited by the minute. You then put your hands and feet up and sure enough you're sticking to the ceiling. Now growing more excited you start crawling around the room feeling more and more happy to actually have the powers of the spider heroes from the comics you love. As you got down you want to see if you're just as flexible as any of them. You attempted a backbend and was able to do it perfectly. Then you do a pretzel position and likewise was skilled at it.
As you got up to do some heroic poses and sexy poses you begin to actually like the changes made to you even more. You don't mind being a girl possibly forever since you've now become your comic book crush and use the powers given to you to do good for people you like and people in general.
Not feeling like changing you decide like Spider-Man and Spider-Girl to keep wearing your spider suit and put your regular clothes over it. Afterwards you walk out of the dressing room deciding what to do next.