My Husband Only Spoiled My Mind

I wish to confess that i saw my husband having sex with his aunty i caught them red hand in room when they both were naked, now i cant forget that and my mind always advise that for justification i must have sex with uncle her husband he is innocent in this case but he is 10 years elder to me, this i told my husband also he agreed for that .. how selfish he is ! I am really upset. and want to try the same most of the time it happened uncle and me alone at home while my husband at work and aunty at her brother’s house. I seduced one or time and got positive response but i avoided i mean controlled my self. but uncle doesn’t know my husband has sexual relation with his aunty. i am frustrated confused . should i do that ? should i save my husband what to do.. I have a son in 4th std. Ohhh god give me right thought .. how can i spend rest of my sex life i feel i can cool down my self after taking revenge having sex with uncle number of times and open it to my husband and his aunty.