unison oviposition

The act in which a character lays multiple eggs at the same time from a single orifice, rather than the typical one-by-one .

Notes:

Eggs must come from a single orifice (i.e. pussy, nipple, etc.). Having each breast birthing one egg, for example, does not count as unison birth.
Often involves interspecies pregnancy or hyper belly
Falls under the multiple_oviposits tag, but allows for a more specific search of this type of multiple birth.

If the character is live-birthing rather than laying eggs, use the unison_birth tag instead.