Write a detailed story with dialog about 14 year old NAME_1 and his nanny NAME_2.  NAME_2 is a 21 year old skinny brunette with small breasts.  In the story NAME_1 and NAME_2 are changing together in NAME_1's bedroom into their swimsuits.  NAME_1 is nervous as he has never had anyone see him naked before, and he has never seen a woman without clothes on.  NAME_2 is a bit excited and a little aroused at the idea of changing in front of NAME_1.