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...
That startled me. I thought he was 
going to give me a kiss goodbye.
.أربكني ذلك. ظننتُ أنّه كان سيمنحني قبلة وداع
Schreck, lass nach. Ich dachte schon,
das wird ein Abschiedskuss!
Qué susto. Creía que me iba a dar
un beso de despedida.
Vaya susto. Creía que me iba a dar
un beso de despedida.
Il m’a surprise.
J’ai cru qu’il allait m’embrasser.
Mi è preso un colpo. 
Pensavo stesse per salutarmi con un bacio.
Que susto. Achei que ele fosse
me dar um beijo de despedida.
Я аж испугалась!
Думала, поцелует сейчас на прощание.