A family of Marisa trespasses Yuuka's flower field. Marisa declared she's strong and will take everything from the weak Yuuka.
After being beaten by Yuuka, Marisa ask for forgiveness and take back her words. But Yuuka agree with what Marisa said. She's strong, so she will take away everything from Marisa.
Yuuka type is strong and know a lot of yukkuri anatomy for torturing. Because Marisa ruined her rose, she need another enjoyment to pass the winter. She tortured Marisa and promise she will let Marisa and her children go if they manage to get through winter (still far far away). If Marisa dies, she will move to the children.
Of course this is because she want to torture a yukkuri with will to live instead of breaking so quickly by the pain.
Then there is this self-proclaimed pervert Anon. He do home declaration to Yuuka's flower field. Yuuka know she can't win against human, so she let go the flower field. That Anon is so disappointed.
Next day, Anon buried himself in the ground after crushing the shivering Marisa and take away its hat. He did a declaration against Yuuka again.
Finally Yuuka, knowing it's that human again, gave up and start torturing the human. He only ask Yuuka to stay from the eyes because he still have long life ahead. Yuuka goes on, poking, tearing his skin and put sand on it. Bite his flesh and put bugs on it. Pokes on his nerves.
He's a masochist (imagine fanon Tenko) and Yuuka ends up mentally exhausted after the torture.
He offered Yuuka to be his pet, and he also have big garden. But Yuuka straightly turned it down.
So, he gave her his burning love.
... and that kids, is how I met your mother.