you may think that Ran's love is a pure and innocent thing, but that is only if you're already dependent on her. if you're already on your feet in Gensokyo, then its a wicked and scary thing.
the villagers who you've come to rely on? suddenly avoidant and estranged, good thing Ran always makes time for visits.
your place of work? suddenly has very little use for you. would be in real trouble with food if Ran didnt share her delicious cooking with you.
your home? suddenly becomes rapidly dilapidated, with no amount of maintenance or repairs seeming to help, and once again Ran offers to save you by having you move into her place. its far way from the village, but your life here have become nothing but misery, theres no way you can refuse.
youkai love is a scary thing if the circumstances are not completely perfect, nevermind the love of a youkai whose species has a reputation for eating men emotionally, physically and sexually.