English grammar is like a box of chocolates: you never know what you'll end up with

I just stumbled upon a really weird detail in the English language.

Consider the sentence, "It has something in its mouth."

Now, add the word 'does' to that same sentence, with no other structural changes, and the verb 'to have' suddenly conjugates in the plural, "It does have something in its mouth."

Why?? The subject is the same, the direct object is the same, the only difference is a single word!

If we replace 'does' with 'really', the conjugation has remains: "It really has something in its mouth."

What in the world is that about?!? I can't think of a single grammar rule as to why that occurs, can someone help me out?

EDIT: An acquaintance read this and then ushered me into the demented little world of helping verbs. "Does" is a helping verb, for which "have" is the default of 'to have' - so ... there. (0.o)

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