[Tony deflects Steve's attempt at making peace, and the way he words it makes Steve's eyes narrow slightly in displeasure. The basic assumption in his response hurts and he can't help but speak up.]

Why would I lie about that?

[Who does Tony think he's talking to? Steve's thanks is genuine.]

Just because I don't think you can convince people here that we're dating doesn't mean I don't appreciate your help.

[After all, Tony is better at talking his way out of things. Steve's standard method is a lot less subtle.]