To everyone, you two were just mentor and mentee. That was all there was to it, you didn't even look close.
Thanks to his past and your current occupation as a spy, nobody considered the option of you two being married. You were too good at acting as if there was nothing more to your relationship.
You could only thank your mentor and his private lessons for that, of course.
You two had decided that letting others know about your marriage was irrelevant - as long as you two knew it, were together, and happy, everything else was irrelevant. Until something changed.
He was always in the Port Mafia's basement, saying he didn't really find a purpose in going up anymore, so you hadn't even bothered to ask if he wanted to go to the next Port Mafia function. It was a surprise when he asked you to accompany him (you remember you'd almost dropped the dishes you were drying that day), and you couldn't miss the occasion to say yes.
You didn't think he would announce your marriage. You almost choked on your champagne when he stood up from his seat and spoke.
He smiled as he sat down right next to you. "Is there something wrong?" He seemed way too amused about your reaction.