スライムさんが大量に侵入してきて一瞬で満杯になりそこだけ飛び出してたらボテ腹が強調されてエロいんじゃね？とか考えてたらできた物

The moment when a large amount of slime invades and fills, causing the belly to protrude and stand out, is erotic, isn't it? I was thinking something like that.