If problem with IAB is settled (rules is cancelled or Eric and Calleigh work only on different cases) and if Н knows about their relationships as a boss, I think they couldn't keep in their feelings and allow a soft kiss or gentle gesture. But not absolutely public and not often, for example, in the morning when they head to workplaces later they have a night together. I guess Calleigh is able to show her love, but she must be sure in her partner and his aims about her. When Eric will convince her that she is sense of his life, that he is dependable person, that he is not going to break her heart, then she'll leave off to be such hardening. There are not doubts, whom this is speech about.