Alra Prison

A plant monster that has a huge flower as part of her body. She can freely control the flower attached to her body, and uses it as a cage to keep her prey locked inside, thus gaining her name. Locked inside her prison, the man will be attacked by countless branches of ivy. With all four limbs bound, the man is helplessly milked inside her prison.

Like this, she can trap the man inside of her forever, using him to supply her with semen. Essentially becoming a part of her body, he is kept inside of her until his natural lifespan is over. Until then, he will be bound and squeezed for his semen by the ivy continuously.