I'll go for mine in that case.
My Esperanza Shepard is a Earthborn, Sole Survivor, Paragade. She tends to see herself in terms of her job description. When she was Alliance military, she was military to the bone. She spent most of her Mass Effect days being the best damn Spectre she possibly could. Garrus reminded her of the cop who got her off the street once she got to know him. In 1, they actually had a give and take, rather friendly (mostly neutral options in the dialogue). Esperanza liked Garrus and Tali a hell of a lot more than anyone else on the ship simply because they weren't there for a check or to hide behind Normandy's guns, but on their own initiative.
That being said, my little vanguard is not a friendly person. She kept everyone at arm's length in 1, except when she was punching them in the nose. By the end, she was starting to feel a bit closer to people, past her hard, crunchy exterior and her cranky, snappy interior.
And then she died.
And was thrown to Cerberus -- something she NEVER forgave Liara for. There was also the minor heartbreak of Tali telling her duty had to come first, something Esperanza has always lived by. Of course, the good Council girl went STRAIGHT back to the Council as soon as she could move again. And the Council told her to go finish looking into things and wrap it up. My Shepard read that as indicating wariness. TO OMEGA. Doctor Solus and Archangel later, she realizes it's her old partner in heroism. (In my headcanon, he recognizes Esperanza the second he sees her plow into a merc, fists flying, with that good old vanguard yell).
This time around, Esperanza lets herself get close to people. She doesn't think she has a choice. She expects to die on the suicide mission, and it's her way of not dealing with A) she's with Cerberus, no matter her reasons, no matter how the council feels and

the fact that she was dead. She finds herself getting close to Garrus, Thane, Kasumi, Samara, Tali and Mordin. She likes Jack, but Jack's as crabby and forthcoming as my Shepard when asked personal questions. She finds herself liking Garrus. It'd never occur to her to be attracted to him, at first, and that seems mutual.
When she's high off her butt on painkillers and the reach and flexibility dialogue pops up, she asks to spar first. When shot down for that (going hand to hand with my Shepard is a bad, bad idea anyway), she propositions him. And he takes her seriously. OH BALLS. A few very uncomfortable days later, Tali and Kasumi convince her to go for it. She finally relents and does. She's still not completely attracted to him, or doing the reading to figure out how this will work herself. But he's her best friend at this point, and she's tired of not letting anyone under her skin.
Headbumps, but not much else, ensue. Collector base, suicide mission, return. Boom, Arrival happens. When Esperanza comes back from that, she's changed. Cold. Distant. Back to square one with an extra helping of ****. Garrus gets her to talk eventually. Very slowly. There's probably some tears. And she tells him she's got to go back and face the music, that she doesn't know what'll happen. The dutybound Spectre falls to pieces over the choice she had to make, and the ones she didn't even get to TRY to save. That's when they really set up as a couple in my head.
In my head, neither of them are particularly physically attracted to each other, but they're a couple in spite of that. In 3, they're used to it enough by the date that they start to be attracted to each other. They're also best friends and feel very comfortable together.
And then Shepard dies again.
Go Shepard.