Remi is saying the equivalent of "get a room" just my guess
In that case, I'll go wait in your room, okay?GET A ROOM!!
lit: Go back and do that in your room!!You stupid horndogs!
Remi uses slang in this case, the word "bakappuru", a combination of the word "baka" or "idiot/foolish/stupid/etc", and the borrowed word for "couple", "kappuru".Ohh...Sakuya-san! Sakuya-san! I've finished work for today!Thank you for your hard work, Meiling. But, I still have...