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microdynamicrifle
I can't think of a romance off the top of my head, but if you're alright with series that have that same level of gap moe as Tatty does, then what I'd recommend is:
Kyuujitsu no Warumono-san It's about a Demon General who's really intimidating on the job, but is more lax and fond of cute things when on his day off.
I'd list more, but I can't think of any more off the top of my head.