@3ds1234 Not saying I disagree with you, but we should stick to the "it is what it is" XD
Just like the "step siblings" is there for when it's...well...STEP siblings, and you can't just slap "incest" on it cause it's not, regardless what 'Muricans say.
So Vanilla is, or should be, the very definition of "normal", common, etc. Meaning, Happy Sex, Couple, etc. No blackmail, cheating, rape...but also no incest, no threesome, etc.
Again, you can make a wholesome threesome manga, ofc you can. But you can't just add the Vanilla tag.