[X] [... If Ayako wants it]
First, yes I am enjoying the story Erien, and I like Ruby as well. I also like that we Ruby isn't lewding little girls as well.
Second, while I think others have said as much as well, I believe the potential benefits of using Ruby outweigh the drawbacks or costs. Yes, Ruby is an amoral, perverted stick with a penchant of using suspicious and probably/definitely illegal substances. And this is only from my understanding of Prisma Illya, not whatever happened in Ataraxia. But Ruby is also powerful. Ruby has allowed a 12 year-old little girl (albeit one with assumingly great potential in being a mage) with no training at all to match threats that Servants could potentially struggle with. And we already established somewhere in this thread Zelretch doesn't just give away Kaleidosticks for shits and giggles. We shouldn't pass up on this potential ally, even if (It? She?) is dubious.