G/Sam
G was born a Sentinel, but nothing ever came of it because of his family situation. Unfortunately for G, they kicked into overdrive in one of his foster homes. His foster parents thought he was crazy and had him institutionalized for some time. During this time, he learned to dial them back to what he thought was normal levels and it was never an issue again for him. The Sentinel and Guide Center of LA was already established when he joined the NCIS LA branch and all personal were required to be tested. There he found out what he was, but also found he didn’t need a Guide. Blair and Jim were flown in. They realized G dialed his senses down too far, far below even normal human levels. G’s partner, Sam, who had been tested and found to be a Guide, was called in to help. Sam not only helped G raise his senses to normal levels, but also up into Sentinel levels. G was sick for some time as his body adjusted back to the way it should have been. Sam, who had been divorced (amicably) from his wife and had joint custody of his daughters, moved in with G. At first, it was just to help G recover from his sense sickness, but since they got along so well, they decided to make it official. They were the first Sentinel/Guide pairing at the LA branch of NCIS.