New to all this, we enjoy mfm with a guy we know. Not cuck at all.
I'd been in my wife's butt twice, didn't go well. All good.
We got more comfy each time we have him over. I'd say 10th visit, about 6 months he's doing her doggy like she likes. He reaches for the lube, tells us he's gonna slide into her butt, with me she would have said no way, she just stays on all fours while he lubes them both, starts to push in REAL SLOW, looked like her eyes were gonna pop out, he gets the head in, she's panting like a dog, he went so slow but got all the way in. He starts long slow full length pumps, she's grunting the whole time. Went on for maybe 4 minutes, he pulls out, she flops onto her back with a look of...what the hell? Since then he's done her butt a lot, cums back there about half the time.