write a story based on the following text:

My name is NAME_1, I am 33 years old, I am of average build, an ordinary boy, I have been in a relationship with NAME_2 for 8 years, she is 27 years old and I was her first and so far one man. My penis is rather average 16 cm, while NAME_2 is a girl with big breasts and a small hairy pussy. For a long time, she fantasizes that NAME_2 will cheat on me with someone who has a much bigger penis and will do something with it that she does not do with me, e.g. take the penis in her mouth, do the first anal, and especially let the other guy cum in her pussy .