Ep. 3: Ako and Riko practice intimacy with a dummy after finding a suggestive magazine in Keita's room

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While searching through Keita's room, Ako and Riko discover a dirty magazine depicting siblings in a threesome. This discovery leads them to wonder if they might eventually engage in similar activities with Keita. To explore this possibility, the two girls decide to conduct a practice session with each other. They utilize a dummy to represent Keita during this rehearsal. The episode focuses on their interaction and the specific scenario they are enacting based on the material they found. Their actions are driven by curiosity about their potential future relationship dynamics with Keita, as suggested by the explicit content in the magazine.