There‘s surprisingly much bottom Hank on AO3! Unfortunately a lot is also OOC or just ignores his doughy old man bod and describes him too favorable but there are def good ones there
Luther is honestly just so gorgeous. I love everything about him and I want to read a million hurt/comfort fics where Hank and Connor bust an android prostitution ring or something and then get Luther as a housekeeping android to help him acclimate but it all leads to a good good good poly relationship where Connor most often doms the other two