I think that dude's a novelist. A pervert novelist.
He has big eye bags because he spends his nights writing depraved stuff that would get him jailed in most countries
Maybe he could be a ghost, actually. Helping the shrine maiden with supernatural stuff from time to time. Tormenting her most of the time-

She's not supposed to be one of the twins, despite her looks and art style. I just happen to have /a few/ obsessions. But a while back, someone on deviantart suggested that in an alternate(?) future the twins become actresses in erotic B movies, and I like that idea very much

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Have a nice day!