Nice position for mutual penetration

Here’s one for the an(n)als:

have your partner lie down in front of you on the bed, flat on their back. They then lift their left knee up toward their breast, then roll their torso and left leg toward their right until their left knee is touching the bed and they are on their side, sort of in fetal position but with the right leg out straight underneath then. Now you have a clear shot at their genitals and ass for penetration.  You straddle their right leg to penetrate, which is perfect to place a flanged dildo upon and ride while you fuck them. I did this to roaring success last night…

I also want to make some underwear with a proper hole to fuck my partner and simultaneously hold my dildo in my ass…