Did you defeat the witch? If not then you should leave (You can't fight her until you've bonded all the kids in the village because you are supposed to lose that fight. If you click the statue outside it tells you how many bonds are left in that area. It'll say something stuff about the bonds of others blah blah blah then since you're in the beginning area it should be a number between like 1-5 or however many kids are there. I think five total or four.
At any rate, if the dark skinned boy is on the world map try seducing him multiple times out there and try it also when your lust level is high like 50+ probably all you need. Also a lot of the time you need to flirt (show off panties / boobs) to advance events with the kids. Namely the Black haired kid and the blonde haired kid. Blue haired kid you have to model for him on top of the mountain behind the village. On average it takes like 4-5 flirts to progress certain events. Some events you also need to have high lust rate to essentially coerce the kid into having (sprite) sex. In the first town you get caught and receive a game over scene.
Anywho hope this helps. I am personally stuck on part 2 after witnessing a couple prostitution events and then getting up to the point where I can do a blowjob on one of the kids.