How NOT to Summon a Demon Girl 17 (Patreon)

This summoner has made a critical mistake, one that will have oh so sexy consequences.

If you like slower transformations, you're in for a treat.

The end....or IS it?

I have an idea on how to continue it, but I'm not sure if I want to do it yet. So we'll see how I feel next weekend. If not I've still got loads of other story ideas