Ik, not a popular ship, but I like it.

U SIGMA.

Sigma was on his desk. Nikolai was also on Sigma’s desk. Between Sigma’s legs. Both men were sweating, panting, flushed with lust. And that’s when Fyodor walked in to find an erect Sigma straddling an erect Nikolai. Fyodor paused. And IMMEDIATELY started the inappropriate comments. Nikolai just giggled and hid his face in Sigma’s shoulder.

It’s coded with Nikolai having an exhibitionism kink, so if you want, just in front of Fyodor.