To make sure I understand you correctly, you’re saying that to please my girl, rather than try to last longer I should attempt to simulate a knot? How should I go about that?
Ah no... I had two unrelated points there: 1) don't stress about how long you last just make sure her pleasure is your main goal, so if you can't get her over the line by humping find another way that she likes to make sure she is satisfied. 2) I know some people try to simulate a knot to heighten their loves pleasure, I haven't done very much knot simulation myself as while I have spend time with a good number of bitches over the years, I have not done much experimenting with such things as my time with the girls is not a regular thing like it is with my love, whom is male. And if there is any mounting to be done, it is he that is doing it. As such my main point was if you do try such things, you need to be very careful how you do so, because she has a lot of nerve endings in the area and you don't want to hurt her by over doing anything.
If your asking how it can be done I'll explain the theory, but it may or may not work with your girl. Always read her body language to make sure she is happy with what your trying.
So the first approach is to gently pull the outer part of the vulva to stretch it out away from her body, because it is designed to stretch with the knot the area is reasonably elastic, but obviously don't pull beyond the point you feel any resistance. The idea here is that rather than it stretching in a ball shape the pulling makes it stretch more in a sausage shape so it has the effect of pulling it more snugly around your penis and changes the position of the clitoris slightly so penis movements can work on her clit on a slightly different angle.
The second approach is to actually use a toy with an inflatable knot too lock things up properly, then very gently, slowly push and pull on the toy to simulate the natural movement and heart beat of a male as he is tied butt to butt. If the toy has a means of pumping fluids you could periodically squirt a bit of the fake lube cum stuff that comes with such toys. but this is not going to feel the same to her as a male squirting jets into her as the fake penis doesn't have the same contraction occurring that the real thing produces when jets are fired into her. So from a pleasure point of view it probably isn't going to do anything special for her. The addition of a bit more moisture probably isn't a bad thing though as it will possibly help with the toy remaining slick inside her.
The third approach is penis augmentation either with a canine penis sleeve where you penis fits inside something shaped like a canine penis with a knot. But given the ones I've seen don't look to be the correct shape of the real thing I'm not sure how effective it would really be, as they are designed to be inserted and removed while the knot is formed. And the larger ones may pose a risk if it is to big and it locks into her. Since because it is solid it can't shrink down to come out again. But as I say they aren't the correct shape to match the female properly so I assume enough force will get it out again, but that may hurt her. And we don't want that
Alternatively you can rap something around your penis base to create a much larger girth, then cover that with the condom to ensure nothing comes in contact with her insides. Something that is easily moldable would be best such as I don't know say soggy sheets of paster. What ever used, it must be safe for being contact with skin for a reasonable time as while the condom my protect her this is wrapped around your penis. So you don't want to damage your own skin either.
The fourth method is similar to the first except this time you use a cock ring or hold your penis behind your testicles so your balls can't disappear into your body and then push into her fully as far as you can, so your testicles also enter the opening to the vulva and then pull her lips around behind your balls. Keep in mind though there is a fine line between pleasure and pain and if your in far enough her contractions may apply some pressure to your testicles. The same applies if you've pulled the condom down over your balls, as most aren't designed to stretch that much without resistance to provide a seal and prevent fluids from escaping.
Well they are the basic techniques I know of for simulating a knot. But I must stress I have not used methods 2,3 or 4 personally (So if anyone who is having regular sex with a bitch can see any issue please correct what I have said. I have dabbled with method 1 with a big Tibetan mastiff girl because she was quite loose and I kept pushing hair in when pushing into her, so stretched her out and held her vulva around my penis while I humped into her. Which meant I had to hump fairly slowly but she still seemed to like it, if the penis milking she gave me was anything to go by, so we both had fun.