Me and my friend would like to book two second class coach seats on a NightJet train from Vienna to Venice at oebb.at. We'd really like them to be next to each other, ideally, facing each other. However, the ticket booking service does not seem to offer such option.
While it does allow us to specify whether we want a window, center or aisle seat (see the image below), it says nothing about where those seats would be located in relation to each other.
Is it possible to book 2nd class seats together? If not, what would be the least expensive alternative rail service that would guarantee that we are seated next to each other?