A gentleman, I think, should not fiercely pinch the nipples of the woman who is sucking his cock. But this is a rule that may be honored more in the breach than in the observance. Especially in a bed that already has bondage ropes tied to the headboard:

black man pinches white woman nipples very hard while shoving her cock down his throat

Photo circulated on some amateur and BBC/cuckold sites back in the day, but I don’t have any real provenance for it.

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