Has any Buddhist ever talked about postponing Buddhahood forever, but not for all sentient beings?

Has any Buddhist ever talked about postponing Buddhahood **forever**, but *not* for all sentient beings? I do not, I suppose, mean because the "bodhisattva" enjoys life. I am trying to ask about "compassion " for some group or even individual, if that is possible? I don't mind if the answer ignores the alledged universality of Buddha-nature, but would prefer if it was from that perspective.