Slick And Slippery

Wife has always loved anal and played with her sis since they were tweens. She has her best climaxes with dildo or her small fist in her bum.
We talk about getting her buggered good by a real big dick and gets us hot for it. I picture her on her knees blindfolded and wrists tied to the bedposts. I want to oil her arsehole and spread her cheeks to show her big red hole to a massive black mamba and take it in my hand and feed it to her as she gasps and moans and begs for it. Over the years the dirty slag has actually squirted a number of times taking toys fingers and fists up her guts. I'm getting stiff writing this down, will have to have a tug or make her blow me.