我很喜歡你呀 in a specific context It may be somewhat inappropriate, but I have to talk about this short story （在明孝陵乘涼 by 魏微）at a seminar:
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I have been taught &quot;我喜歡你&quot;, when said between people of opposite sexes, usually means a romantic kind of fondness. In this story it seems the girl likes her brother in a not so innocent kind of way. Is this clear to the brother, when she uses

炯，我很喜歡你呀！ ;

or is there enough room to interpret it as innocent fondness among siblings?
"我很喜欢你" has the almost same usage with "I like you" in English, depending on the scenario, could be treated as "I love you" but again, it's rare. 

In daily case, we(native Chinese) rarely use(or used?) this sentence because comparing to the western people, Chinese usually are regarded as a group people who are shy, barely express emotion orally.  

But in this case, the author seems like depicture a little girl who has a crush on her brother. It's unethical but also natural considering their age. And it's far from incest since it's just an emotional activity.