Rebirth in One Piece as Deputy Captain - Chapter 489

Seven years ago, Shen Qianshu is impregnated with Ye Ling’s child in an accident.Seven years later, the little boy becomes famous and is thought of as the nation’s son.

Before Li Daniu had time to be excited about being a prince who was about to ascend the throne, he learned that his country was about to be submerged by sea water.

“Can I wear it back?”

- Description from novelbuddy

Our straight (?) bottom woke up ten years into the future and found himself on the bed of his childhood friend… At the start, the bottom was shocked to his very bones, but he soon quickly accepted this premise and found the whole situation to be rather amusing. Precisely then, the bottom once again went back to his timeline — back to when he and the top were just platonic childhood friends.