Only want the knotting sensation, or need the appearance and all?
If the first works for you, an inflatable would suffice and...
Seems chinese people thought bitches deserved a decent fuck when inseminated, so there are those tools that might have some use
hxxps://es.aliexpress.com/item/1005002876014191.html
I mean... $30 to $40 for a silicon dildo with inflatable knot and squirting including antireflow and an storage box valve is nice even in white and no texture... Someone with artist talent ought to buy those bulk, then add silicon color and textures...
Because we all think the larger, the better I went for the F model which is sort of too long for me, but shesh. Fun all the same.
Must say silicon is decently soft, but has a metal tip that makes it a bit too rigid, so it is actually more unconfortable than the real thing (This one only inflates knot, real deal enters like a finger, then grows in all directions and the tip will easily find its way) But the knot, yes, it works and gets propperly stuck.