To the original topic, maybe a fix to this would be that some characters have lower approval if you have a summon out, therefor trusting you less? Like many wizards and other magical beings wouldn't care but a druid or paladin might, and while they would not be outright hostile the lower approval would show they don't trust that? If the system was to be made more comprehensive, could apply to other types of summons like fey or such and summons added later. I do think the lack of reaction to the devil/demon can be... odd at times, even when considering how lower level fiends are often made into slaves and servants by wizards/warlocks, but I also don't want summoning type characters to get heavily penalized cause Summoning is the thing I love.