Suzuka visits her brother Hikaru and discovers his secret sexual relationship with Tomomi-senpai, who suffers from non-pregnancy lactation. Driven by jealousy and her own hidden struggle with lactation, Suzuka reveals her secret, leading Hikaru to provide simultaneous relief to both women. Through an intense and lewd encounter, Hikaru helps them both release their breastmilk, cementing a strange, symbiotic bond between the three.