anyone know how to get to or get the lupa? Never seen it before or anything or even knew about it until I looked at the pervert section, same for the mouth fiend

If you make a brothel girl choke on your salami too hard, can't remember which one, then you will get to the mouth fiend content.  

(´∀｀)

https://itch.io/t/665002/where-i-find-mouth-fiend Already answered for Mouth Fiend.

For Lupa (if it's want I'm thinking) she is the involved in the last bounty hunter/brothel quest.