bit late to the party but thought OP might need a bit of real advice.
It took months of experimentation while absolutely rat arsed to learn DP was in to butt stuff. turns out he loved the idea of it, and is sort of bi-curios when drunk (then feels grim afterward) ANYWAY
I got us a small set for about £22 and he hated it. It came with O rings, which we kept & used as cock & ball rings. then we got the new one from Lovehoney, 8inch realistic. he loved it.
Last month, i splashed out on a RodeoH harness and a Doc Johnson UR3 realistic. he loves it. It's so realistic, feels real, and warms up to the touch. excellent.
It didn't take a lot of pursuading on my part, he just said "yes" straight away. we do it every now and again and he loves it. We're getting the hang of it now after a year of doing it. He said it somehow feels wrong and absolutely mindblowingly amazing.
Takes a bit of experimentation, and lots of communication, and trust, just like every other kink.
I was talking about, earlier, how mumsnet likes to clutch its pearls at threads like these. I love sharing advice about things like this, that's quite taboo. Mumsnet isn't too fond of taboo, Have fun OP.
Also, if you think you don't need more lube, you need more lube. The nostalgia-freak in me got some lube that tasted like calpol. it's so fun.