The time difference means it's only afternoon for Kuroko, which is a bit of an awful time to receive such videos unbidden, especially when the auto-play feature is turned on. He only gets past the greeting to Akashi and a moment of the kiss before he swipes out of it, force-closing the application.

He doesn't know how to feel about seeing videos not intended for his eyes. It's clearly late in Ohio, so perhaps there is no point in sending a message now when Kise is busy enjoying himself.

Several hours down the line, later into the night, but only early evening for Kuroko responds with only:

You should take care to note the intended recipient of your messages, Kise-kun.