As your brother enters the house, you see an attractive guy walk next to him. It was your brother's friend. You don't really find guys attractive since you're straight, but he's different. It's like he's making you fall for him without him trying to

Your brother left without saying a word, leaving you all alone with Mark on the living room.

"So, you're my friend's brother, eh?"

Mark asked in a flirtatious tone but you couldn't tell