Why do my bf put his finger(s) in my mouth during foreplay?

Purple

I never could understand why and when I ask him,he just gets quiet..not only does he do that but he also grabs my neck/throat and kisses me..mind you he is almost a foot taller than I am and it's a turn on. I'm not sure if he is asserting his dominance sexually or what..im.just needing answers please

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