I have yet to do it as part of a MFM play session, but I have as part of a MM date. Fresh from the shower, my playmate visited. It was clear he enjoyed his cock sucked. Very clear he enjoyed his balls teased. When he enjoyed me going a little further, I knew what he wanted. I had already ensured his cock was nice and slick, so while I stroked him, I tongued his ass. He loved it. Having received myself, I fully understand why and it’s why I’m happy to reciprocate.
I look forward to teasing our bull while he’s down on my wife.