He offers Peach a stay at his castle

Peach was at her lowest point. Mario had cheated on her and even her own servants were looking at her differently. A castle full of people and yet she felt alone. Until she had received a letter from Bowser. It was an offer from him and Daisy for Peach to spend some time at his castle while the scandal dies down. Peach accepted the invitation and once her things were packed she was off to Bowser's castle, willingly this time. She is welcomed by the staff as she is guided to the throne room to see Bowser.