Please do stroke your cock. I am stroking my cock as I retell this story about that time in my life. I too spent a lot of time at bookstores sucking random guy's cocks. I loved the perversion of it all. The dingy, dimly lit, video booth section of the bookstore, the smell of cocks and cum and disinfectant. I liked the groups of guys loitering near the video booths waiting for a cocksucker like me to come in to suck their cocks. I liked it when they began to recognize me as a guy who wanted to suck their dicks.
I hope that you get an opportunity to suck cock in front of your wife. It is very exciting. Both my first wife and Kate enjoy(ed) seeing me suck the cocks of guys who are/were fucking them. I suck the cocks fo some of my oldest closest friends who fuck my wife. Their wives have no idea that their husband fucks my wife or that their husband lets me suck their cock. I have probably sucked some of our friends' cocks more often than their own wife has LOL. I probably like sucking them more than their wife does LOL.
Some of our friends like it when Kate and I suck their cock together. We put the head of their cock between our lips and kiss each other, licking and sucking the head of their cock was we kiss. Then we take turns sucking their cock and licking their balls, then we switch off, taking turns sucking their dick. When one of our friends is here for some fun, their cock is the focus of our attention.
Have you tried watching porn with your wife of Bi MMF situations and seeing how she reacts to the guys sucking each other? You probably have already thought of that.