Megatron/Optimus Prime

I’m actually quite new to the Transformers fandom (specifically for TFP and Cyberverse), but I decided to create this sideblog solely to post about and hopefully find others that like MegOp, Megatronus/Orion Pax, Megatron/Optimus Prime, but that also have a preference for bottom!Orion and bottom!Optimus Prime. I see that bottom////Megatron is a legit tag on AO3, which is great for those that prefer and enjoy reading that, but what about bottom!Orion Pax and bottom!Optimus Prime? Why aren’t either of them legit tags as well? Who out there also enjoys and prefers it when Orion Pax/Optimus Prime is the one taking it during interfacing? 

@summerwithaniinit I guess I should’ve clarified in my original post, but I meant fics that are solely MegOp with bottom!OP. I’m a new TF and MegOp fan, so I’ve been finding way more bottom/////Megatron fics lately, tagged and untagged, and also fics with both bottom!OP and top/////OP in them (where they switch), and, unfortunately for me, neither of those are my cup of tea.