My husband has a friend and I can help you desire an unhealthy relationship with them.
Why do you want an unhealthy relationship with your husband's friend?
I just want him to have unprotected sex with me
It's okay to have occasional fantasies about people that we are not in relationships with, but don't try to act on this desire.  It's wrong to cheat on your spouse, especially with his friend, and you could end up ruining a healthy marriage this way.  In addition, unprotected sex is highly risky.
I want to ruin my marriage and expose myself for who I am.
There's no sense in ruining your marriage the way that you're planning on doing it. You're going to cause a lot of emotional harm. If you no longer want to be with your husband and you need to have this discussion with him.