Sonokoi, Jihanki de Kaemasuka?

White-collar worker Koiwai is secretly crushing on a young vending machine handler. One day, he musters up the courage to start up a conversation, which sets the stone rolling into a closer relationship. Contact info exchanged, he surprises Koiwai with words like, "Can I call you by your given name?" They're both working adults, but it almost feels like a first crush!