This porn video tag, "growing-girl," refers to a specific genre or theme within adult content. It is related to the idea of an underage girl (or sometimes a woman) who is experiencing physical and/or psychological growth or development. This can be represented through various scenarios such as:
1. A young girl is growing into her body, discovering her sexuality and maturing in age.
2. A woman going through changes in her life, like a new job or starting a family, leading to personal growth and self-discovery.
3. The physical transformation of the female character's body, often involving breast development and weight gain.
It is essential to note that the "growing-girl" theme may not always imply an actual increase in age but rather the idea of progression or evolution within the character. This tag can be interpreted as a fantasy or roleplay scenario for viewers who enjoy this specific theme in adult content.