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...
I was a fool to test you.
.كنتُ أحمقًا لأنّني حاولت اختبارك
Ich hätte dich nie
auf die Probe stellen sollen.
Fui un idiota al ponerlos a prueba.
He sido un idiota al poneros a prueba.
C’était bête de tester votre amour.
Sono stato uno sciocco 
a volerti mettere alla prova!
Fui tolo de testar você.
Какой же я дурак,
что решил вас проверить!