The protagonist Mitsuki is reincarnated into another world.
There she ends up as a slave, but is then purchased by a beastman and begins her new life as a maid.

Mitsuki is of the age that she is highly curious about her "nighttime duties."
One day, she overhears one of her maid friends speaking about a certain topic of interest.

"I never dreamt that a penis could do that. Not even in my wildest dreams..."

It would seem that the genitalia of beastmen are different to that of humans----?

On the other hand, Mitsuki's beastman master Berthold see her talking cheerfully with a human man...
and while he maintains a calm and gentle outer composure, he is seething mad with jealousy...