@Jonny5, I love how sexually adventurous you and your wife are. When you're both willing to try new things, there is always something new, and you develop so many sex-play options that you never get bored. Zity is a great place to get ideas.
Here's one you might enjoy if you haven't yet: double dildos.
My wife and I enjoy going butt to butt with an 18-inch long, 1-inch-diameter double dong inserted into both of our asses at the same time. You can straddle each other (with bodies in opposite directions) and fuck each other in the ass while making genital contact. It feels great. You might even be able to fuck each other normally while you fuck each other in the ass at the same time! My wife and I need a longer double dong to do that, howerver.
You can try it alone too. You can feel what it' like to go past your rectum and into your sigmoid colon. There's a new, intense kind of pleasure there. I enjoy pushing all 18 inches into myself and closing my ass over it. They say this is dangerous, but it comes back out easily for me.
I recently bought a 24-inch long double dong for my wife and me to try to fuck each other normally while simultaneously fucking each other in the ass. Unfortunately, it was way to thick for my wife. Until I unpacked it, I didn't realize it was 2.75-inch diameter! I love the monster up my ass, though, especially when my wife fucks me with it When she pushes it in 12 inches to hit the first turn in my sigmoid colon, and then she pushes and pulls 12 inches in and out a for a few minutes, I'm drenched in precum, and almost the instant she grabs my cock she makes me explode. We're looking for a 24-incher that she can handle too.