I fail to see how this is helping at all. [Impassively, he watches as Mukuro preens and maybe rolls his eyes when the demon isn't looking.] And I don't think you need to be so vain when it's only something like this...

[Still, pride is one of the seven deadly sins, and Mukuro is a demon. He guesses it can't be helped in the end. Patiently, he waits for him to pose before glancing into the camera. He's never really taken a selfie before.... let alone with another person. In fact, the last time he might have smiled could very well have been for his school pictures...]

[Still. He tries this time, lips curving shyly and subtly upwards- ]

[Which of course Mukuro ruins with his little stunt.]

[Predictably, Chikusa jerks away, face flushing and fingers clumsy over his phone's screen.]

What was that-!?