You cannot actually make the vagina shrink. Surgically it can be made smaller. But nothing makes it much smaller.
But you can make it tighter. or at least feel tighter to a guy.
You have a lot of abdominal muscles that impact the vagina. Mostly they are in there for child birth and some to control your bladder. But you can learn to control them. You can tighten them up and it will force the vagina down around anything that is in there. Like a penis.
I have heard, but not experienced, of women who could control the muscles around their vagina so much that they could milk a penis of cum without moving their body. In fact it is possible to tighten up so much that the guy cannot get his penis out once he is in.
I know that some of this is possible since I have been with women who were so tense that I could not get my penis in. If they would have been able to maintain that tension while fucking I would have been in heaven. Alas, once they learned to relax, they were really relaxed.
- Response by welloone
, A Mr. Married Guy, Male, 66 or older, Retired