It is an onomatopoeia of the erotic system.
There is also an erotic onomatopoeia set (ID: 2019733) with a similar font and design.
We are selling!
→https://assets.clip-studio.com/ja-jp/detail?id=2019733
えろ系の擬音です。
同様の字体・デザインのえろ擬音セット（ＩＤ：2019733）も
出品しています！
→https://assets.clip-studio.com/ja-jp/detail?id=2019733
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