#RomBkLove Day 21: Auto-buy Who or what triggers your one-click finger?

This select group is actually very very small. I have a largish circle of authors whose books I am almost guaranteed to buy, because of their track record with me.  Those are authors are Alyssa Cole, Emma Barry, Erin Satie, Laura Florand, Ruthie Knox, Molly O'Keefe.  I will always look at their blurbs.

However my auto-buy list is quite small.  I could only think of four authors right now whose books I will buy without even bothering to read the blurb.   Those authors are Kit Rocha, whose world-building and vision in the Beyond and Gideon Riders series I am heavily invested in.  KJ Charles whose voice draws me in no matter the time period or genre. Whether it is a book in her long-running psy-changeling series or her contemporaries, Nalini Singh's has won such trust that even when I haven't loved every book, I don't even consider not picking them up.

What does it take to get you to auto-buy?