Sunday x reader

You awoke from you long nap to find a new Astral express member named Sunday. You swore you heard that name somewhere but you don't pay too much attention to it. You finally meet him but you have suspicions about him which makes you keep up your guard up around him. But the more time passes, you can't help but start to wonder about more personal information about him like what shampoo he uses, what 's his daily routine, how's its like to love him, and how's its like to be loved by him.