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...
But I can't make him suspicious of me, either.
.لكن لا يجب أن أجعله يشكّ فيّ أيضًا
Aber er darf mich nicht verdächtigen.
Pero debo evitar que sospeche de mí.
Pero debo evitar que sospeche de mí.
Mais cela paraîtrait louche…
Ma non posso rischiare di insospettirlo...
Também não posso deixar
que suspeite de mim...
Но вдруг он что-то заподозрит?