Told to suck by wife while deployed

While I was deployed my wife and I would send dirty emails to each other. One such email, she said that she wanted me to suck a cock. We had discussed it before, but hadn't done it. I told her I would suck this guy i pulled guard with and she had me call her so I could tell her again, while she got herself off. So after we talked, I went to work convincing the guy to let me(wasn't that hard). I sucked him in the guard tower and where we slept, but he didn't let me swallow his cum, he would make me stop, and finish himself off. Well when I told my wife what I did she got pissed and now I still want suck cock. I haven't since then but a day doesn't go by without me thinking about. Partly because I'm mad that mine is the only cum I've tasted.