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> 彼女の細い指先を、舌がぬらりと踊ると、明かりに反射した光がうっすらと手に貼りついた。
>
> Once her tongue slid around in a dance, she gently stuck the the "明かりに反射した光"
> (spit?) onto her hand using her slim fingers.

(normally there isn't anything that hard to read in a H-scene, but if you
havn't realized the context is a BJ, with the speaker asking her to used her
hands along with her mouth with spit as lubricant :X)

  * can 明かりに be an adverb, as if 明かり is a na-adj? Is 明かりに反射した光 gibberish regardless?

  * Is the meaning between 指先を光が手に貼りついた and 指先が光を手に貼りついた interchangeable?
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2018-09-28T06:05:16.440
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question
parsing
To what extent can a noun be used as an adverb?
明かりに is not an adverb. 明かりに反射した光 means the light that is reflected from the
(surrounding) illumination.

it's not 指先を光が手に貼りついた, it's 彼女の細い指先を舌がぬらりと踊る or her tongue danced on her
fingers.
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2018-09-28T16:20:57.777
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answer
明かりに is not an adverb.

反射する means "to be reflected"

Example  
声が山に反射する。  
The voice is reflected by the mountain.  
[https://dictionary.goo.ne.jp/jn/181252/meaning/m0u/反射/](https://dictionary.goo.ne.jp/jn/181252/meaning/m0u/%E5%8F%8D%E5%B0%84/)

So the translation becomes:  
明かりに反射した光  
The light that was reflected by the lamp.
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answer