The twins?
The Merc Twins, aka Cain Instinct, aka Orsair and Riasro, aka The Underdraft's Drone Killers.
How they smooch:
Orsair usually doesn't have time to have long moments with his person of interest so his kisses are very quick and intense. Stolen in stairwells and alleyways. When he does have time to chill out they are very gentle and appreciative and he's more focused on cuddling and other physical contact. Smooch on the head as he's heading out the door for work and a majority of the time the person isn't even awake but it matters to him that he did it.
Riasro is similarly busy so his affection is also spontaneous but in a more playful way. He'll actually stay and chat a bit when he suddenly shows up and grabs his person from behind and squeeze hugs them, and of course he won't let go until he receives a kiss kiss. Quantity over quality for him. Kiss on the cheek, kiss on the lips, kiss on the nose okay he has to go now byeeee. Spider man kiss if he sees his person while he's on the job and it's a slow night.