adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
Describes a soft, elastic texture that yields to pressure and springs back, like a baby's cheek or a soft toy. Often used adverbially with と or as a する-verb.
赤ちゃんのほっぺたはぷにぷにしている。
The baby's cheeks are squishy.
このスライムはぷにぷにとしていて気持ちいい。
This slime is springy and feels nice.