How is he in heat if he's on his period?
It's the body's first time becoming feminine. Let's give it some time to settle in womanhood
You can't ovulate and expell at the same time, I get he's not human but still, from a biological standpoint it makes zero sense.
from a human biological standpoint yes. but animals like dogs bleed just before they enter the heat phase so its probably something like that
How is he in heat if he's on his period?