Coming-of-Age Ceremony: Losing Means Becoming a Succubus to Continue the Bloodline

The coming-of-age ceremony. Yale prepared for this moment for a full 18 years…
If he won, he could continue living as a man and enjoy a peaceful future.
If he lost, he would turn into a female succubus…
In the end, he still failed.
“Here, swallow this pill.”
Sure enough, the next day he transformed into a succubus.
“Hmph, so what if I did…”