【Kamiko!】The sister of a gal with a boyfriend is crazy about her brother’s dick.

Synopsis

This is the first time I’ve ever seen a girl with a boyfriend who is not happy with her sex life. This is the first time I’ve ever been to the beach and I’ve never been to the beach before.
Then Yuna notices something. “What’s with all the gal stuff? Seeing Yuuji’s impatience, she starts teasing him. When she provokes her brother with her own body, he gets an erection. Yuna is intrigued by his erection. When she pulls out her brother’s dick from his pants, she finds a huge cock…!

Yuna was puzzled, but she gradually became curious about the condition of this huge cock. It’s not a problem if you wear a rubber. It’s the first time I’ve ever seen a girl with a condom.

Of course, her true love was her boyfriend and part of her research… but… Please enjoy the relationship between sister and brother that grows deeper and deeper along with their physical chemistry!

14 basic CGs
192 CGs in total

There is a difference of the dialog, the drawing character, and the existence of the pubic hair.