Stick

Flambae, running a warm hand over Robert’s shoulder as he passes his cubicle: Don’t buy lunch today, Punkass, I brought that pasta you like

Robert, immediately after pressing a kiss to Flambae’s cheek: Great work on that last mission, Shit-For-Brains 

Flambae, wrapping his arms around Robert as he microwaves his coffee: Hey Fugly, are we still on for tonight? 

Robert, in the middle of a heavy makeout session in the locker room: Wait, Asshole, did you remember to call your sister about Saturday? 

Flambae, curled up with Robert in bed: Goodnight, you fucking freak. Love you

I saw this picture of mark and I just had to

Great dialogue can come from radical emotional honesty. But in most real conversations, people

dodge questions

answer indirectly

lie (badly)

change the subject

crack jokes to avoid serious answers

lie (convincingly)

say half of what they mean

tell the truth but get so anxious/angry/defensive others now think they're lying

If your dialogue feels unnatural, it might be because everyone is saying exactly what they think, or articulating their thoughts too well. Try letting characters hide things instead.

people don’t always speak in full sentences,

slang can change depending on age range, demographic, etc. &