童心未泯俩小无猜迁就
[tóng xīn wèi mĭn liăng xiăo wú cāi qiān jiù]
This nickname suggests a relationship or state where both people are still childishly innocent and naive (童心未泯 means retaining the heart of a child, 俩小无猜 means being innocently together since childhood). '迁就' indicates tolerance or adapting to each other.