After defeating dudley in Eurydika. The "hot spring" will emerge, and there will be a man standing next to it. Keep talking to him until he asks u for "1 Piece" of wood.Get it from the nearby Cuckoo forest. Come back and give it back to him. Sleep in the little inn over there until morning.
He wud have built a hot spring resort, with 2 sections for males and females. Once u finish the game and u have connie with u, go to the resort at night and you can peek at her from the males' side. Just examine the wall until a W mark comes. Press and Hold O to see connie in her bikini(Pervert)