Looking for a story about female to futa accidental drug trial

Story by Notjackrabbit

Looking for a story about a woman named Helen who goes in for a drug trial and is accidentally given the wrong drug and it turns her into a futa. She meets the man who accidentally got her drug and he slowly turns into a woman and changes his name to Raven I believe. The drug trial goes on for a few weeks which they continue to change more and more.