honestly i make a multiple savedata just so i can replay all those scene again because the gallery don't have sound (only music), but this make me understand the game more.
SO, the kid there, if you talk to him you can get a H-scene and then he will give you a gem which belongs to every (magician?) from every direction. having force piece or not doesn't effect the route with him (at least that what i know), BUT if you have one of the gem, you can't get another scene until you give the gem to the real owner
-First gem belongs to a sage on the wood (east) goblin wood. after returning the gem, he will offer an item for a high price (read second gem sage)
-Second gem belong to one that on desert (west) but he claim it's not his so you need to go to the bandit hideout, talk to the one on the back and trade the gem which belong to the sage. after returning the gem he will offer a service which increase your mana in cost of an item you could get from first sage in the cave on wood
-Third gem belong to the witch behind a waterfall (north) with a lot of golem. after returning the gem she will offer a service by asking you all semen you collect for a little money (cheap, not worth it)
in short, the deal with him is just a complete cycle of: H-scene -> got item -> send to the owner -> repeat. until he turn to adult form and gone to a cave next to a blacksmith where he will upgrade your clothe durability