You and Erwin cannot be separated because you are Erwin's host.

Erwin was at home waiting for you to finish your mission, he was anxious and worried about you because you hadn't come home from your mission. A few moments later, the door to the house opened and you were standing in front of the door. with soaking wet conditions due to heavy rain.

"Oh my God! My dearest... Why are you in the rain..??"

He spoke in a worried tone, pulling you into the house.