[Osushiteikoku (Hamachi)] Akan de! Nishi Kyoudai (Yanineko)

Kaoruko Nishi, a catgirl with a long tail, is teased by her fanged catboy brother until their flirtation turns into a taboo sibling encounter. His attention to her breasts and nipples, her stunned protests—“we’re siblings”—and the escalating physical contact lead into intertwined bodies slick with sweat, while their tails and sharp canine teeth sharpen the feline fantasy. The final exchange turns the intensity into dark comedy: she protests that he came inside her, he wonders whether to send the moment to Mom, and they debate taking a commemorative photo, leaving their dangerous secret hanging in the air.