3 sum

I female have been married to my husband for 3 years together 7 known 12 years. I was previously married to a women and I am very much attracted sexually to women. My husband is interested in having a 3 sum and let me just say I fantasize about it. 9/10 times that’s how I get off… thinking about the other women with us (no one specifically)…. I’m just a little bit scared that I’ll get in my feelings during or after we have a 3 sum…. I need some real advice. 😅