This begs the question: do thirens based off of oviparous animals (animals that lay eggs) lay eggs themselfs? Or are they too human for that? This question begs another, much weirder question: do female thirens based off of oviparous animals lay unfertilized eggs during mensturation?
Either way, you probably shouldn't eat that, Wise.

Logically speaking, they shouldn't lay legs, but logic hardly matters with them.
As for why, remember that eggs don't grow after being laid, they would need to lay eggs large enough to contain a fully grown baby, which equates to even more difficult births because an egg isn't as squishy as a baby.
There would be no reason why they wouldn't lay unfertilized eggs, since getting rid of the unfertilized egg is the point of the menstruation process.
So yeah, menstruation would be the equivalent of suffering through childbirth every single month.

Don't ask why I had such a detailed explanation ready.

Plot twist: Those eggs were stolen.

Incineration said in comment #2624492:

Logically speaking, they shouldn't lay legs, but logic hardly matters with them.
As for why, remember that eggs don't grow after being laid, they would need to lay eggs large enough to contain a fully grown baby, which equates to even more difficult births because an egg isn't as squishy as a baby.
There would be no reason why they wouldn't lay unfertilized eggs, since getting rid of the unfertilized egg is the point of the menstruation process.
So yeah, menstruation would be the equivalent of suffering through childbirth every single month.

Don't ask why I had such a detailed explanation ready.

Im not a woman so i cant confirm this, but if im not wrong women get hungry during that time of the month (maybe due to the pain? Again, im not a woman so i couldnt give you a good awnser), which might explain why cissia is always hungry.

Oh my god bruh what am i typing 😔

hmmm... author has not yet confirmed if the outfit cissia is wearing is in fact based/inspired by Springfield's Cafe outfit

Incineration said in comment #2624492:

Logically speaking, they shouldn't lay legs, but logic hardly matters with them.
As for why, remember that eggs don't grow after being laid, they would need to lay eggs large enough to contain a fully grown baby, which equates to even more difficult births because an egg isn't as squishy as a baby.
There would be no reason why they wouldn't lay unfertilized eggs, since getting rid of the unfertilized egg is the point of the menstruation process.
So yeah, menstruation would be the equivalent of suffering through childbirth every single month.

Don't ask why I had such a detailed explanation ready.

So just mildly worse than normal periods. Checks out.