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Extra Summon Bonus Proof
Fragment of a discussion from Talk:Succubus Doll Bag
Apparently you're not, so just for you, here you go:
Base:
http://i.imgur.com/piCN9Rs.jpg?1
Incubus alone:
http://i.imgur.com/93vMDF2.jpg?1
Incubus + Succubus:
http://i.imgur.com/hO6CbIA.jpg?1
You clearly lose the original incubus bonus, and only gain +5 from the incubus + succubus set bonus.