If you start at the campfire, go all the way right until the game won't let you to find the shrine and crystal you need, and there are two sex scenes available in this area afterwards. One with Ash, the other with Lyric. You'll have to choose which you want to encounter.
If you want Lyric, run directly left from the campfire, and he's lying near a lake. If you want Ash, there are two sets of giant pink mushrooms that kinda look like background items. They're kinda behind the giant rock platforms, with the fire in between both sets. One platform has a Faerie lying on his belly, and interacting with him, he says something ab jumping on the mushrooms. The set behind him leads to a chest. The set that leads to Ash is on the opposite platform. You should see a Faerie sitting nearby, swinging his legs. You have to get to the top of that set of mushrooms and jump-dash to the right to land on a kinda floating platform.
If you don't want to experience any sex scenes, just interact with the campfire.