Slime Tensei. Daikenja ga Youjo Elf ni Dakishimeraretemasu

On the verge of his death, a great sage reincarnated into "Infinite Evolving Slime" which he created with great sorcery. He decided to enjoy his new life, rather, new slime life, but his elf disciple, who is also his adopted daughter, caught and tamed him... (Source: Junk Burst Translations)