Rika moves in with Naoya and the others, and insists that sleeping in the same room with him in a non-sexual fashion should be completely permissible. Naoya agrees, but only if all the girls get to take turns sleeping in his room in a non-sexual fashion.
You said you wanted to prove you 
wouldn't mess with another woman, so...
...قلتَ أنك تريد أن تثبت أنك لن تعبث مع امرأة أخرى، لذا
Du wolltest doch beweisen, dass du
die Finger von anderen Mädchen lassen kannst!
Hai detto che volevi dimostrare
 che non faresti niente con un'altra donna...
Você disse que queria provar que não faria
nada com outras mulheres, então...