Cuddly
It was a side of them that they never showed other people. The vulnerable, affectionate, cuddly side. Of course they kissed, held hands, and hugged in public, but that was normal.
What wasn't quite as normal, was the fact that in the privacy of their own room, they slept so tangled up in one another, that it would be difficult, for one to tell where Octavia began, and Lincoln ended.
It wasn't always after sex, often times it was just as they fell asleep beside each other, they curled closer and closer, like a pile of puppies. They liked feeling the solid contact of the other.
Naturally, this was only when they were alone, whenever they had to sleep near others, they instinctively muted that need. They still slept near each other, holding each other, but it appeared more normal. Her back against his chest, his arm around her waist.
They didn't want everyone knowing that two Arkadia's most fearsome warriors were extremely cuddly.