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...
If I happened to hear Sis's 
voice in those situations,
إن حدث وسمعتُ صوت أختي
،في "أوضاع" كتلك
Ich könnte es nicht verkraften, wenn ich Yor
bei du-weißt-schon-was hören würde!
Si llego a escuchar gemidos de Yor,
mi corazón no lo aguantará.
Si llego a escuchar gemidos de Yor,
mi corazón no lo aguantará.
Si j’entends ma sœur crier au lit,
je crois que ça me détruira.
Se dovessi sentire la voce di mia sorella 
in uno di quei momenti,
Se eu ouvisse a voz da
Yor naquelas situações,
Не дай бог, ещё услышу,
как сестричка моя там стонет…