In Toronto, I attended a workshop on using medical leeches for kinky activities.
Wow, I learned so much from Morpheus on this. First: no need to kill them or use salt or fire — simply use Tiger Balm, they hate that.
Or wait for them to finish feeding — they will simply roll off on their own. Second: they can live a long time — the perfect pet, just needing to be fed once a month.
They can be used for fear play, but also to remove bruising and other subcutaneous blood pooling.
