plump
むちむち ムチムチ むちむちボディ ぽちゃり むちましい 丰满 プランパー 抱き心地良さそうな極上の安産型ムチムチ女体 小肚子 抱き心地良さそうな極上のムチムチ女体
Slightly chubby, but not enough to be fat. A saying that goes around for plump is "Fat in all the right places".
The Japanese tags above are Pixiv's equivalent of the word, but be aware that not all Pixiv-centric uses of those tags fit AIBooru's definition. As with all other size-specific tags, observe the body and see if the tag actually needs to be used before adding it; make sure that the body is not simply “curvy” and that it’s not “fat”, either.
Plump is mutually exclusive with fat and obese.
Examples
See also
The following tags are aliased to this tag: chubby (learn more).