Shion | That Time I Got Reincarnated as a Slime (EXTRAS) (Patreon)

The explanation for this is in the post below. The idea initially was a mission from Rimuru that she took too literally and ended up with this. She was supposed to bring them milk and bread from their city to their village and make this people be allies. But she didn't bring anything because she misunderstood for milk breast. 😅