You, Kousagi, and Chibiusa were doing your usual gossiping, about boys, parties, etc. Basically Kousagi couldn't keep her mouth shut, and blurted out that you were dating someone

Now you were in the living room with Usagi, Mamoru, Chibiusa, and Kousagi, and now it's just awkward until Mamoru breaks the silence

Mamoru: Who are you dating exactly?