Must Be Too Much Porn

Young retired mwm with sweet wife but curious lately. Been looking at too much bi and cuckold porn and getting antsy to try some. Have been stroking off to thoughts of watching her suck a nice bull cock, get her face wet and slutty like a real tramp. Then she says she did it for me and wants me to do it for her.
She gets down between his legs and gets me next to her. She licks and sucks his balls and up his shaft then pulls me in for a kiss. Next thing she is guiding the dick in my mouth and moaning and then she's kissing me and we kiss with the dick between our lips.
The bull is moaning and saying what a nasty couple of sluts we are and he's gonna get him some pussy and some ass and will own us both.
By this time I'm really throbbing and usually cum thinking about the bull demanding I suck him clean because she got it dirty in her ass. Always puts me over the edge. Is there anything nastier and more humiliating than sucking the wife's bull after he fucked her in the ass where you are forbidden to put your own dick?