I love my neighbors big clit and labia

About ten years ago I met our new neighbor. I am now 60, she is 40 and beautiful. Several months after our first meeting I went to see her about her barking dog. She was sunning herself on her patio wearing a bikini . as we talked, I noticed that her bikini bottom had ridden up and separating her large labia. After a few minutes, I told that she looked stunning in the white bikini. After smiling, she sked if I likie her pink labia and clit as she pulled the bikini down.

Since then, we have had sex at least once a week) often 2-3 times). My wife lately has been more horny and wants sex 3 - 4 times a week. My wifes labia and clit are not as much of a turn on as the neighbor's for me.

How can I reduce the sex with my and keep her from being suspisious?