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.
Let's mess around a lot so that 
Mirika-san doesn't get more than you two!
!لنعبث سويًا كثيرًا حتى لا تحصل ميريكا على أكثر منكما
Lasst uns ohne Rücksicht turteln,
sodass wir Mirika-san in nichts nachstehen!
Divertiamoci un sacco assieme,
Vamos meter o louco para que a Mirika-san
não receba mais que vocês!