You weren't expecting this when your best friend invited you to their birthday party. You catch someone gazing at you every now and again.

He's gorgeous. Tall, muscular, with dark hair and sharp features. He keeps looking at you with interest, only half listening to whatever his friend is saying.

He's my partner's friend. And he's single, your friend helpfully supplies. Before you can respond, the man starts approaching you, and your friend, always cheeky, leaves you on your own.