This is the only correct answer here.Not at all. Babies exit out of vaginas every day and they return to their previous size. Sort of part of the design
Vaginas are meant to stretch to accommodate a literal human and go back to form. Trauma and childbirth are the only things that cause a permanent, physical change.
You can cause permanent damage to the area if you really try with long-term large object insertion (ex. a bottle, baseball bat, fist, etc), but a penis of any size isn't enough on its own to make any lasting changes.
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