Reincarnation to the slacker life

Sel, the demon king, reigning supreme, had only one thought in his mind
'fuck I'm tired'
his death, caused by his own son didn't even surprise him, and his last thoughts were of the eternal rest that would follow.
but as fate would have it, he found himself in another body, looking up at an unfamiliar smiling face
what has life planned for him??
'wait they can't be g-cups right??'