So my oc is a insectoid anthro and I wanna give her a ovipositor designed specially for inserting into a females anus so obviously it needs to be tapered so it is easier to enter however I also want the experience to be pleasurable for the recipient so I'm thinking adding something question is which would be most enjoyable
Something comparable to the barbs of a feline penis
Nubs
Ridges
Ribbing
Or some combination thereof