Standing on the boardwalk like this makes you feel amazing. You can almost taste the jealousy of the people passing by, wishing they had your perfect plastic body. While their human bodies will eventually fail and rot to nothingness, your beauty is eternal.
Being ogled by these pitiful creatures makes you hot with excitement.
You almost don't notice the tingling sensation in your face. Your squarish chin flattens, becoming narrower. Your skin smooths out and becomes free of blemishes. Your hair starts to grow and shape itself, becoming a shoulder-length bob cut.
You wish you could be a mannequin forever. You love this plastic form, utterly immutable in its perfection. Most of all, you love how these humans stare at you with lust and envy. Your face takes on a smirk as you stick a white hand into your panties and slowly start rubbing your groin.
You feel your face growing cold as it begins to look whiter and glossier, but you embrace the feeling and rub your crotch faster. Your hair becomes firm plastic, followed closely by your face, locking it in a permanent grin of triumph and lust. As the last warmth of your humanity escapes into the air, a rush of pleasure radiates from your groin and suffuses your whole body - your first orgasm as a perfect plastic object.
Satisfaction fills you as you slowly put your elbows back on the railing, your joints locking into place as you become a mannequin for good. You make one last change and push up your boobs a little, and then you find yourself unable to move.