Wife is ready!

Looking for opinions here, my wife has finally agreed to having sex with my friend. He is very large, approx 10.5 inches. I am not, I am about 5 inches. She has recently really started to talk about it and what she would like, when I asked her about the set up she says things like if I want his cock in just gonna pull it out which is great. She has made a few comments about where I'd fit in as the cuck, she said I'll be keeping his cock in her, sucking it when it comes out, pumping the cum into her, and likely riding him, her comment was " well I wanna see you bounce your little cock in his till ya cum! Any advice? Hasn't happened yet but soon and I've never done that kinda stuff, I'm open to it... I do want to suck one some day and wouldn't mind my ass getting fucked.... Any input is welcome! Thanks all!!