Spending more time at the office wasn't how you'd like to spend your time, but the money was good, and you needed it, especially now that you and Monica moved in together. Your relationship has been "good", the only thing preventing it from being great was the time you two spent apart.
Turning Monica into your girlfriend was one of the best decisions you ever made, especially because of how understanding she was. It made you feel bad that you had to work so much, neglecting her a little bit, but you remind yourself you're doing it to live a good life and be able to spoil her.
So, when you came back earlier from work, all the feelings were replaced with a surprised look. She was waiting for you, in a rather very pleasant clothes. Her grin betrayed her fake innocent tone "back so soon?" she asks.