Peter makes the rounds, greeting friends, introducing his arrival with Lara Jean's hand in his.

He finds Greg playing beer pong and compliments his friend's new home.

Peter does all he can not to look at Gen in her small red party dress. He was here with Lara Jean.

He turns to Lara Jean and gives her his full attention. She offers him a small, sincere smile.

Peter likes being able to tell the subtle differences between her facial expressions. Especially her smiles.

"I'm gonna get you a drink." Peter looks to Greg. "You want some?" Greg says "Yes" as Peter makes his getaway.

Peter finds the kitchen, grabs a few cups, and fills two of them with beer. He opens the refrigerator and pulls out a bottle of kombucha.

Peter makes his way towards Lara Jean just as she's talking with Gen.

"Well you know actually Peter's going to get me a drink, but thank you so much for offering."

Gen's mouth hangs open and Peter is sure in this moment that Lara Jean is the best thing to happen to him in a long time.

It was his turn to play hero.

"Ooh. What's up, babe?"

Peter hops over the couch easily and takes the seat next to Lara Jean. He offers her a cup, the drink he promised her.

Gen makes her exit as dramatic as possible but Lara Jean and Peter pay it no mind.

Lara takes the cup and takes a full swig.

Peter tries not to watch Gen storm off when Lara Jean makes a gagging noise.

"Why is beer so vinegary?"

Peter chuckles at the mistake and informs her it's actually not. He offers her the right cup as he takes back his kombucha.

Lara Jean nods when he reminds her that he's driving. He's not drinking liquor.

"You drink Kombucha?" Lara Jean sounds impressed and Peter can't help but feel a little pleased with himself.

He pulls out his phone. "Here. Take a selfie."

Peter holds out the phone so that they'll both be in the shot when she leans in close to his cheek for a kiss. She hesitates for a moment but he wants her to do it. "It's alright. You do it."

She gives him the kiss, albeit it on his cheek and Peter can't help but smile at the idea that Covey was breaking her own rule, in the most innocent way of course.

The fake couple strike another pose.

Peter's in the bathroom, drying his hands on a towel, getting ready to call it a night. He had promised to get Lara Jean home early.

The door opens and right as Peter says "it's occupied", Gen appears from behind.

Crap.

Peter grips the towel in his hands just a bit tighter than he normally would, on edge. Gen and him alone was trouble. He could feel it.

"Lara Jean Covey, really?"

Peter can't help but scoff. He really had found her weak spot. Why did she hate LJ so much? Was it really because Lara Jean had kissed him in middle school? That sounded … immature didn't feel like the right word. He'd circle back to it.

Peter sits down on the sink, bringing himself closer to Gen's eye level. He does it without even thinking about it.

"What do you care?"

Gen remains silent and looks down, away from Peter. Was he really getting to her? Was making her jealous actually working?

She perks up at the sight of Lara Jean's scrunchie on his arm.

"Aw, this is so cute! Is this hers?"

Gen quickly pulls the scrunchie off from Peter's arm. He puts up no resistance.

How did she still have so much power over him?

"Come on." Peter whispers, more to himself than as a protest against Gen's actions.

She takes the scrunchie and looks into the mirror as she uses the hair tie to make a short side pony tail.

Peter can't help but watch as his ex-girlfriend taunts him.

"How do I look?"

Peter can't lie.

"You look good, Gen. You always look good."

She smiles at his response and Peter hates himself for feeding her ego.

"Come on, give it back."

"No, I'm going to keep it for a while, 'k? Don't worry, I won't tell."

Peter recognizes that evil glint in her eye and knows whatever Gen is planning, it'll be painful.

When Peter makes his escape, he looks for Lara Jean. She's right where he left her, but not alone.

She's talking to Lucas James and smiling. Was that a twinge of jealousy he just felt. For the gay guy she had no chance in hell with?

Peter hasn't had anything to drink all night and he needs to get as far away from Gen as possible.

But he can't leave Covey. He was her ride.

And he also doesn't really want to go home.

Lara Jean smiles at Lucas as he burps in her face. Peter misses the part where it's funny.

"Hey. Do you want to get out of here, go grab some food?"

Lucas shoos Lara Jean away and tells her to go. Peter feels just a bit more secure in his fake relationship. He didn't think he had to worry about Lucas.

Lara Jean agrees to leaving and makes her way to the exit. Peter follows after her.