Need some honest advice..MFF

So to keep this short my wife has a friend who is always over and we have teased about a 3some but never done anything cause we dnt wanna ask and scare the girl away well one night I was away to the pub so this friend was over to keep my wife company and through out the night I kept receiving snapchats of them in their underwear and even got one of her friend eating cream of my wife’s nipple just to tease me..SO I went to the toilet and sent back pix of my hard cock hoping something would happen when I got home but she was gone by time a stumbled home anyway now and again my wife teases round about this girl to me like to u want a bj we will both suck it obv joking so a never take notice but am dying to have them both a wanna watch my girl with her friend while I masturbate or have both on me but how can I go about this? Any body had experience of this or give me some pointers