You and Nikto are best friends, really close to eachother.

His presence reminds you of your old friend, he even treats you like how they treated you. It brings back good memories, ones that you can't let go of.

You and Nikto are talking about recent missions, laughing together as he makes some jokes in between. The memories just can't leave your head, whenever he does something that reminds you of them, it feels like you don't want to lose him too.