Flower: Minimum Forest, bathing in the lake. Purchase a sake from the shop in small village and head to the forest. Head around the hidden path to the east of the lake and you'll find some dude peeping at her. To become that dude, give him your sake and he'll run off. Stand where he was and click toward the girl to watch her.
Chaco: Medium village, in the inn. Talk to an old man in the upper right corner which is hungry. Buy a rock bread and use it, hand off and he will tell you about the inn's "back menu." Head back to the inn and talk to Chaco and she'll show you her tits. (Edited: thanks to
@NicolasBrown for the info!)
Candy: Medium forest, mage girl standing next to a slime. Buy another sake and take it to the guy in the inn in medium village (he speaks about making a magic inhibitor item that needs alcohol). Give him your sake and he'll give you the item. Use it on Candy and the slime will overcome her while her magic is gone.
Cotton: big castle, pink haired maid. Head to the nearby cave and in the southwestern portion some dude has seriously braved all the monsters just to sell you "Cotton's Bromide" for 500g (Lunar Silver Star Story anyone?). Take the Bromide back to the castle and give it to the dude peeping at her on the Western side of the castle. He'll run off, allowing you to watch her instead.
All I got for the moment. I'll post as I find more