She has not yet experienced childbirth. As extreme preparation for the future, she is forcefully inserting a fist into her tight vagina. However, she hasn't progressed to anal stretching yet—her anus is still underdeveloped, so she must carefully expand it from now on. Today, she's determined to gradually move forward with this process. First, she washes her body in the shower and gets into a quadruped position. As she puts on gloves, she nervously asks, "Will it be insanely full?"—but there's no answer yet. Still, having come this far, she can't turn back. Internally anxious about "what might come out," she calmly proceeds by dripping lubricant. First, she timidly inserts her middle finger into her anus...