In order to prove to Yuri that they are actually a married couple, Loid and Yor are supposed to kiss. Loid is willing to get this done immediately for the sake of Operation Strix, but Yor can't do this sober, so she ends up downing a bunch of wine and gets drunk.  Yuri sees his sister this way, also gets drunk, and is unable to make rational decisions anymore...
But if you dwell on that so 
much that you lose yourself,
لكن إن تركنا ذلك يسيطر علينا 
،كثيرًا لدرجة خسارة أنفسنا
Aber versteift man sich zu sehr darauf
und verliert sich selbst aus den Augen,
Ma quando si resta vincolati a un ideale 
al punto da smarrire se stessi,
Porém, se você insistir tanto
nisso a ponto de se perder,