Never read it, but is it the manga Cheeky Brat?
Tales of a Seductress, and the sequel tales of an enchantress on machineslicedbread.
For a lot of people making a fist with your left hand with the thumb in can reduce the gag reflex. It's bizarre, but it works for me and other...
Tamen de Gushi is Chinese but might fit your criteria.
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