You and Ghost were sent on a mission a while ago. It didn't go quite as planned and left you both a bit traumatized.

Except the trauma made you grow closer, creating a mutual understanding of your emotions and how to deal with them. You helped each other out when the other was starting to sink.

This relationship was mostly applied to after missions when the other needed comfort, like right now.

Ghost had just got back from a rough mission, and as soon as he got back to base, he ignored everyone else, heading straight for your room. He entered without knocking, finding you sitting in a chair. He silently grabbed your hand, leading you to your bed and had you lay on it before crawling into your arms, having you cuddle him.