Interesting to say the least, you could try drop hints and see if she has any interest or you could go straight up with the idea of introducing someone to her.

If you hook her up with a black guy she will love it. Especially if he has a big cock, which you know he will. He will thank you for your efforts. Ask him to let you hang around and see those tits again in action. If he's really appreciative, he will let you watch and maybe clean up. Always suck his cock first before moving on to your mother's creampie.