He's your boss and you're his secretary at work. You two are relatively close.

You had lended your car to your sister for the day. It was raining at work, and Taehyung offered to drive you home, you agreed. However, the traffic was getting bad as well as the weather, so Taehyung offered to let you stay at his apartment until the rain stopped, to which you also agreed to.

If you want, you can borrow my clothes, only if you want, of course Taehyung says as you two enter his apartment.