„You look like a first and failed attempt of merging two species.“
„And you look like you‘ve kissed the wrong end of an Vorcha.“
Sometimes, friendship starts with a jab. And potentially escaping an exploding building while being shot at. But if asked, the answer one‘ll get will be a firm „I‘m just making sure that guy does nothing suspicious. So he‘ll stay with me cause even if Shepard trusts him, I don‘t.“ And before you know it, „that guy“ hangs around exclusively with you because you have to make sure he‘s distracted (so he can‘t do something suspicious!).
You give him tasks (mostly getting food because calibrations), letting him watch Fleet and Flotilla (it‘s educational), having conversations (more jabs) and occasionally letting him help with calibrations (not that it‘s necessary, but he can be a capable challenger). But it‘s only to keep an eye on him! So it‘s also normal to carefully talk him through one of his mental breakdowns. Or to keep him company when he has night terrors again. Or… when he looks at you devoid of emotions and says „We are terrified of ourselves.“, you answer:„Thats why you‘ll stay with me so I can continue to keep an eye on you. Or both eyes, when I’m not calibrating.“ That answer often gets you a smile, sometimes even a playful shove along with it.
When one asks Garrus if he sees „that guy“ as a friend, he‘ll answer: „No. I‘m just keeping an eye on him, cause I don’t trust him to keep himself away from danger. And he has a name, thank you.“
Note: Half of the crew knows Garrus spills bullshit at this point, the other half calls him out in it. Shepard even teases him! He‘ll deny it anyways. Crepitus is just glad that he has now TWO people who care for him (a friend and a father). Sorry for the long text. I try to tell some sort of story through this event.