Paperback 
Book 1 of the Infatuated Fae Series
 
"When a trip into the forest to collect a rare nushroom goes horribly wrong, I find myself falling through a fairy portal and straight into the arms of the Unseelie Fae prince. The Dangerously unhinged and handsome Unseelie Fae prince. What could be more horrible than that? He thinks I'm an assassin sent by the humans to kill him, not a biologist"
 
Enemies to Lovers, Portal