Matt and Mello would like to have a safe BDSM relationship.
Matt and Mello would like to use safewords and aftercare and ensure consent.
But the fact of the matter is that it's always better when they mean it.
Every shove that Mello makes, bullying him all the way to somewhere at least partially private, every nudge of a fully cocked and loaded gun to his temple, every degradation, every time he's left crying and sore on the dirtied carpet is better that it would be if Mello showed him the safety was on, took care to avoid shoving him into corners and came back in after the moment was over to scoop him into his arms and tell him exactly how extraordinary Matt is.
And likewise,
Every bite, sratch, punch, kick that Matt delivers, every time Matt screams himself hoarse with the hell sent insults that tear at him deeper than he cares to admit while Mello drives into him, every time Matt flips the situation and gives as much as he got just as hard, every time he comes out of the bedroom to spit at his boots and leave. Its always so much better than if he didn't aim to hurt, didn't take below the belt shots. Better than if Matt would ask to take him and even if Matt came out of the bedroom without tear tracks down his face.
Because that would be lying. And they really are painfully honest people.