The Duchess' Tongue

Belinda orgasmed. Not once, but twice. The duchess groaned as her clits started to be punished by the duchess' tongue. Belinda grabbed her servants and pulled tits and started to rub them hard. I never know what rub means in this context. And can people get some like different techniques? I feel like they just do the same. Rub a tit. But those tits are like paper thin. Like, so it's really just scrunching them really.