Same Zoku e no Sasagemono (Bamboo comics)

[Machine Translation] Avel, the son of the chief of the Tangata tribe, is frustrated with the Miyal tribe that lives on the other side of the island. The Tangata tribe is required to dedicate one newborn to the Miyaru each year, in order to avoid conflict with the powerful Miyaru, who are said to have the blood of sharks. One day, Avel is attacked by a beast and is rescued by a tukiri of the Miyal tribe. Avel's wariness is eased by the unexpectedly friendly and gentle Tuqiri, but the moment Avel notices that he is bleeding, Tuqiri's appearance suddenly changes! Suddenly, he looks almost inhuman, and he begins to have a fit. Aver is flustered by the sight of Tuqiri. The Tangata are a tribe with a special kind of body in which the sex is determined by the first sexual intercourse. If you have sex with a female for the first time, you become a female...! No... I'm the next chief of the tribe...! Avel is also swallowed up by the whirlpool of pleasure while resisting...? Includes 8 pages of newly drawn manga!

「この男の妻として覚悟を決めろ、俺――…」 タンガタ族の族長の息子・アヴェルは、同じ島の反対側に住むミヤル族へ不満を募らせていた。 “タンガタからミヤルへ、新成人を毎年1名献上する” 鮫の血を引くと言われる強靭なミヤル族との争いを避けるために、かつて先祖達が定めたこの忌まわしい掟のせいだ。 ある日、アヴェルは獣に襲われたところをミヤル族のトゥキリに助けてもらう。意外にも気さくで優しいトゥキリに警戒心を和らげるアヴェルだったが、アヴェルの出血に気づいた瞬間、トゥキリの様子が急変！ 突如人間離れした姿に変わり、なんと発情し始めてしまう。 そんなトゥキリに慌てるアヴェル。そう、タンガタ族は「最初の性交で性別が決まる」という特殊なカラダを持つ部族。初めてのセックスをメスとして行うと、メスのカラダになってしまう…！ 「だめだっ…俺は次期族長なんだっ…！」 抵抗しつつ、アヴェルもまた快楽の渦に飲み込まれ――？ 描き下ろし漫画8ページ収録！