instead of talking to the demon try to interact with the gacha machine on the right side of the stall and you can roll for a candy after paying with either money or salmon.
in the current version only the pink candy has implemented events. If you give it to imouto while suggesting to drink milk from the vending machine, it will act as a powerful a aphrodisiac and she will have to go deal with it in the toilet prompting a peeking scene.
