Discovering the K-spot
With your fingers about 1 cm inside your partner's yoni, find the K-spot or perineal sponge by applying pressure on the bottom of the vaginal canal, toward the anal canal. Move your finger up until you feel a change in texture. The K-spot will feel like a cushion between the anal and vaginal passages.
This area can take strong pressure. You can actually massage the anal canal from the yoni if you use enough strength. It's very pleasurable to stretch out this area. The feeling is relaxing, grounding, and exciting at the same time.
Your partner might feel surprised the first time you touch this area. And it might take some time before it gets pleasurable. If she enjoys stimulation there, consider the K-spot a safe place to go when she feels pain or gets too emotional during a yoni massage.