samm penis issue

Hi People

I'm Roshan 28 from India I'm facing issues with my penis's size and my married life is just going imbalance. I'm juz 3.5 inch when full erect and can't hold too long. My wife is also not happy with my size at all. Due to this iI had caught my wife peeping into our neighbour window wher an old man stays. Once I saw from our window that my wife was peeping when i saw clearly the old man was all naked in the house was too big than me. My wife was like hypnotised to his size. She loves watching porns specially the black gangbang and the old men porn.

How can I increase the size of my penis, should i let her enjoy what she wants.

Please let me know.

Thanks