You ever experienced pregnancy yourself?
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While uncomfortable, Brevyn figures that would be a question. It's fair, he might have asked uncomfortable things to others before. He clears his throat. "Like a tree." he has a hard time pronouncing 'photosyntethizing' even though he knows what it means, kinda. "I can also drink plenty of water like a human! I do it with my roots more when I'm sleeping or quiet. It takes a while." yes, he successfully avoided the uncomfortable part of the question. He hasn't lied, so it's all good.
(What he's not mentioning is that, to feed off of other plants, his roots have to connect to those of the plants, and they have to cut some tissue. In this 'verse it works much faster, so picture like a plant vampire, except that he's been feeding off of small plants that don't really possess any humanoid form in order to keep a low profile)