I have nothing particular against the idea at all. One twincest is odd yes but i can deal with it......well incest in general given it's not myself involved (well with mothers or aunts or anything like that....cousins and sisters i suppose are alright or brothers in the case of a female character) anyway also being a Mormon Polygomy isn't particularly wrong to me. Though I have to question the sensibility behind twins when summoning has to have a specification as to the number of beings being summoned. or at least that seems to be a common feature.