Is it permissible for a husband to send romantic messages to his second wife on the day of the first wife's turn?

There is no harm in sending messages to the other wife, but this should not be displayed before the first wife, in order to preserve her feelings. Sending messages does not diminish the right of the one who has a right, and it is lighter than going to her. Scholars have permitted that for someone whose original division of time is day and night to visit during the day, but not at night, to deliver expenses and the like, without prolonging the visit.