I like to do selfbondage and include cbt.
Sometimes it's not easy to do the cbt very hard because you don't know what it does in half an hour so anny tips for hard cbt during selfbondage would be fine
Needle play is a wonderful thing if done correct. I have a commercial Mistress who loves to play with needles .it's more like an artwork on the body .you can make many shapes or oven put ropes between the needles as an art piece