Sure, it feels fine. The whole idea that a pussy gets too relaxed to be felt is not going to apply to anyone with a normally functioning penis. There are issues that reduce sensitivity enough that a fully relaxed vagina might not provide enough stimulation to reach orgasm. And may not be felt to a significant degree through a condom when you have those issues.

But that’s what it is, relaxed muscles. You can get pounded for hours, and as long as you’re in decent health, and have done kegals, you should still be able to engage those muscles and grip just fine.

As a fantasy thing though, it is absolutely possible for at least a few guys in the train to have trouble touching the walls of your exhausted and abused cunt. Even a horse cock might not do more than tickle the sides once you’ve been fucked into a hypnotic state. If those muscles are just too worn out to flex, it’s not going to feel like much compared to when they all got started.

But, give you a few minutes, a bottle of water, and a slap on the ass, and you’ll be able to grip again.