Offline/Nicole
Nicole has to be the safest choice. Maybe she's a nerd, but she looks as bored as you feel. You can probably make that work.
Slinking away from your parents you move a few seats back and take an empty spot in front of Nicole. She's sitting next to her mom, your Aunt Mary. She might be your step aunt? You can't remember. You lean over the back of the bench seating and smile at them both.
"Hey auntie! Hey Nicole!" They both respond in kind. Your aunt looks like she's ready to ask you something but you quickly direct your focus to your cousin. "So Nicky," you start, trying to come across tighter than you are, "I wanted to ask what your plans were this week. Like, was there anything you wanted to do? Anything I could help with?"
"Really Justice?" her mom replies. "That's so unlike you."
What would you know ya damn stranger? "Yeah, well, y'know..." Actually, no, you're not entirely sure know what she's referring to. Does she think you're normally selfish or dickish? You have to think about your answer. "We... just haven't really seen each other in a long time. I thought it'd be cool to spend some time together, tell ghost stories, hang out and stuff."
Nicole looks up from her book at that last comment. She glances between you and her mom, equally confused as suspicious as to why you're really here. At least now that you have her attention, you nod your head a little to the empty spot next to you on your bench. She takes a moment to clue in, her expression mostly unreadable.
"Uh... sure. Here mom, can you bookmark my page?"
Nicole slides into your bench and you make room for her. Her eyebrows are raised, glancing again to her mom behind her then back to you. You better offer her some sort of explanation.
Appeal to her disinterest and invite her to join you
Flatter her and convince her of your sincerity to get to know her