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 you make my sister cry even a little bit,
،إن جعلت أختي تبكي ولو قليلاً
Wenn sie deinetwegen
auch nur ein Tränchen vergießt,
Si haces llorar a mi hermana,
aunque sea un poco, haré que te eje…
Como hagas llorar a mi hermana,
aunque sea un poquito, haré que te eje…
Si jamais tu fais pleurer ma sœur,
je te ferai exé…
Se farai versare 
anche una sola lacrima a mia sorella...
Se fizer minha irmã chorar
uma lágrima sequer,
Если сестричка прольёт
хоть одну слезинку,