@AoYokai Vanilla sex is just a term for "boring" (though that's subjective) or "normal" sex, though it's a nicer term for it so it's used a lot instead of just saying boring or normal. For example, in one of my previous households, I lived with some pretty kinky people, but one of them didn't like any of that stuff, so she was laughing about it and saying "I have the most vanilla sex, but I love it!"
(Also I imagined it. Thanks.)
Shion: So, I don't know what a rimjob is, but I want to know if you're interested.
Nezumi: *spits out his coffee* YES-- I mean--