Does anyone remember this yaoi? It's kind Like a pirate one.

the mc mother wants him to go to an island which idk what is it, and gives him smth. But the trip to the boat um was prob too expensive or full? So he had like one choice but I think the boat had requirements which to be like, sex slave? For all ppl there. And the captain err is fighting to find a last map treasure, and yk the mc mother, actually gave him the last map. So go on and on. Pls help me find this.