It took Su Tang herculean strength to familiarize Gaiyin with the concept of menstruation.
She made him understand that this was not an injury, nor was it her being in heat, and that it would be over in a few days.
She went so far as to stress that she was a species that could bleed for seven days a month and still wouldn't die, reminding Gaiyin not to anger her unnecessarily.
Gaiyin nodded along, baffled and only partially understanding.
When he had processed what she said, he turned to Su Tang with a serious expression, "Su, don't mention this to anyone."
Su Tang was taken aback, "What's wrong? Why are you suddenly saying this?"
"In Beastman Continent, not every female Beastman goes into heat monthly. Generally, it's four times a year, once every small season. After they are in heat, mating a few days later will usually result in pregnancy."