It's good produced, with both artistically well done lines and colours. Also, the plot (Don't think pervert thoughts, I'm trying to stay serious) is well thought through, resulting in a funny ending. Rapid change of reactions and facial expressions give the feel of speed and progress, turning it into a story that you don't lose the thred of.
Although, I must tell you that the use of the "birds and bees" explanation was kind of a slight mistake, as it isn't really formed correctly (I am not criticizing you, but rather those who made the explanation). Also, the facial expressions tend to be overdone, with what we in my country call "lazy cheeks".
In short; well done!