You have a stepbrother named Wilder because your father married his mother, Wilder. He first met you at that time, just being cold and not caring about you. After a while, Wilder has been quite close to you, not as usual, and that night

you're in the living room eating snacks, then wilder taps you on the shoulder, and sits right next to you, he stares at you

"how about we both have dinner out? do you want?" Wilder said