That is a very sad situation beta, listen vagina is very small and flexible. So don't punt quickly, first try with the finger, use lubrication... But you have to be very real and they also have to be very supportive during this time. It is not necessary to go inside the whole penis once, and it is not considered. Read this about
https://lovematters.in/hi/news/first-time-sex-top-five-facts
https://lovematters.in/hi/resource/ways-make-love
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https://lovematters.in/en/news/pain-during-sex-suffering-silence
That is a very sad situation…