Okay, I know Ratchet and Drift are canonically conjux endura in the comic but Ratchet is single in Prime.

I do, however, ship him with Wheeljack. The homoerotic tension is there, man. 

However, however (lmao), I also am in love with him.

Yes, that's right. I'm in love with the cranky old ambulance.

Deal with it.

He's such a tired grump. I feel like he just needs rest, a day off, and a bottle of hard vodka. 

Optimus probably understands why he's so snappy with everyone, he's surrounded by younger people and they're all energetic and loud and he just wants to get his job done in peace. 

Not to mention everyone manages to break every single thing he needs. "I needed that >:(" lmao, poor guy

I could fix him. Or in this case, cheer him up.

I don't feel sexual attraction towards him like the others, and I feel like his feelings towards interfacing are the same. He's simply lived past that point. He was young once and now he's not, and he just wants to be comforted and come back from work to relaxation and quiet.