Nothing related to his weight, or your thighs. It simply happens because your vaginal opening gets stretched during sex and he pulls out completely between thrusts. Your vagina is then open, letting air in before every thrust. I'm surprised he doesn't notice it - normally a woman's vagina feel cavernous whenever I do this (by accident), so I normally make her queef to get nice and tight again.
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"Failing tastes of bile and dog vomit. Pity any man that gets used to that taste."
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