[WIP][Caption needed] The cat tree (Pixiv Fanbox)

Just some kitties humping away their boredom ;) Hi y'all! Hope you are well! This is just a spontaneous idea I'm working on that just needed some input from y'all! Please post your caption down in the comment if you have any. I'll put them in with the finished piece later this week :) Have I told you that you ROCK? cuz u do!