My Profession Is Life Coach

In 2142, rules descended upon Earth. Everyone gained a "profession," like characters in a game, with profession-related skills and levels. People leveled up to gain skills and improve their competitiveness in the workplace.

The bottom wakes up one day to find himself in a world where the rules have descended. He's lost his job, has no savings, and now has a cat that keeps meowing for cat food.

To help make ends meet, he goes out looking for work and gets a job at an employment agency, introducing people to professions. On his first day, he meets his first client, who claims to be his cat's biological father.

Bottom: "What kind of work have you done before?"

Top: "Demon King."

Bottom: "...Do you have any special skills or certificates?"

Top: "Destruction."

Bottom: "...What kind of work would you like to do next?"

Top: "Be your lover."

Bottom: "Thanks, but you don't meet my standards. I like people with boobs."

Later...

The Demon King takes off his robe and puts on a shirt. Later, he takes off the shirt too.

Bottom: I can work with those pecs.

The top is the long-sleeping Demon King, the "Death" in the rules. The other rules tell him that "New Life" has arrived, and that he is your lover.

So he comes, searching for the love destined for him.

A pure-hearted Demon King awkwardly learning how to date x a playful, theatrical bottom

Theme: There are 360 professions, and every one can produce a champion.