This is Dr. David.
you can use lubricant and slowly pull back the foreskin slowly on a daily basis to slowly stretch the foreskin.
and over time, you will be able to pull back the foreskin while erect.
you can also do this in the shower as well with soap as a lubricant.
make sure you pull back the foreskin daily to wash with soap and water.
I would use a water based lubricant like KY jelly.
vasaline is oil based and hard to wash off.
water based lubricants are easier to use
yes, you can use lubricant there. and it will help the foreskin slide.
but it will not stretch over night.
it can take weeks and weeks to slowly stretch the foreskin.
and it will get better with time.
best of luck to you.
let me know if you have other questions.
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