[It's nothing short of a miracle that he doesn't flinch at the touch of that tongue, even if there is a lot of tension building in his body. Spine ramrod straight and breath held in his lungs, Reid endures the odd sensation best he can, knuckles slowly turning white as he clenches his fists in an attempt to not freak the fuck out.
Oh God. Why does he always end up in situations like these?]
I don't doubt that for a second. [He swallows, visibly uncomfortable.] Symbiote? As in... symbiosis? Two organisms living in co-dependency.