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...
so I admit that I was a 
little envious of you two.
.لذلك أعترف أنّني شعرت ببعض الغيرة منكما
Deshalb beneide ich euch ein wenig.
Me dan un poco de envidia.
Me dais un poco de envidia.
Alors je vous envie un peu.
quindi ammetto che un po' vi invidio.
então confesso que senti
inveja de vocês dois.
поэтому даже немножко завидно стало.