Accidental unbirth, pokemon
Groggy trainer tripping and falling onto one of her pokeballs; the small orb getting swallowed into her folds in one fell swoop. Once the shock wears off, shaky digits reach up there to get it back out but only manage to enlarge it to full size.More desperate pawing and clawing at the sudden stretch only manages to push it all deeper until the button gets pressed by her cervix, unleashing the mon inside right into her womb; passing out hard from the shock.
When she comes to again, she almost thinks it’s a bad dream, at least until she sees her distended tummy. The ball getting squeezed back out at some point during the impromptu nap, quickly grabbing the slimy orb and recalling the pokemon in her womb; vowing to never use balls again.