TS Big Brother: Complete Feminization Through Erotic Research

Synopsis

■This is the 3rd work in the TS Big Brother series! Reading it together with the previous works will make it even more enjoyable!

【Concept】

A story where an older brother becomes increasingly feminized through various erotic demonstration experiments.♡ Enjoy watching a completely feminized big brother who happily responds like a girl when desired and has desire thrust upon him.♡

【Plot】

Once a protective older brother. But now that relationship is beginning to change dramatically.

Tenryūin Saine—a genius researcher who developed feminization drugs and supplies them to Yui. She contacts the big brother through Yui to request cooperation for “a certain demonstration experiment.”

The Narukawa siblings are invited to the Tenryūin family mansion. The experiment details presented to them in the lab are:

—Constant biometric data collection via smartwatch and smart ring.

And they must always comply with the experiment instructions sent to them.

No matter what the content might be…

The brother hesitates for a moment, but is drawn in by the exceptional compensation: all living expenses during the experiment will be covered by the Tenryūin family.

However—

As the experiment progresses, the brother comes to realize:

His own “feminization” has already advanced beyond the point of no return…

【Included Scenarios】

– Pseudo-NTR sex with sister’s friend in front of sister using a sexaroid

– Simultaneous nipple teasing with sister and her friend

– Embarrassing sex while being watched by sister

– Passionate sex with sister’s jealousy directed at him

– Rough sex with sister’s possessiveness directed at him

– Intimate sex at a hot spring inn

And more

56 pages main content + pubic hair variations + no-text variations

Original size: 2894×4093px