Dr. Peko Himitsu no Shinryoujo ~Hito ni Ienai Sei no Nayami Kaiketsu Itashimasu~

This clinic offers sexual counseling and treatment with full confidentiality. Dr. Peko runs this secret clinic and excels in solving all kind of problems thanks to his ability to change the shape, hardness, smell and taste of genitals including components of semen.

[From vndbreview]