Forbidden Desire in the Ocean

My name is Ember. I went camping at the beach with my mom, stepfather Mark, and stepbrother Julian. Mom told me not to swim too far from Julian, but I swam too far anyway and suddenly got a leg cramp, almost drowning. Julian saved me in time, holding me in his arms and massaging my cramped leg. Mom and Mark left satisfied, telling us to "get along well." In the sea, Julian's hands became increasingly bold. I should have pushed him away, but I completely succumbed to the forbidden pleasure. After returning home, I started to actively approach him, and Julian went from teasing me to possessively wanting to keep me by his side forever.