Stepsiblings // A Bughead story (COMPLETE)

Marriage

BETTY
Two weeks later.
I'm scared.
Our parents have invited Jug and me to Pop's Chock'lit Shoppe. They claimed to just wanting some burgers, but we know, that they have something on their minds.
Jug and I are already sitting in our usual booth, waiting for my mother and Jugs dad.
We order a chocolate and a vanilla milkshake and Jug takes my hand under the table. He must've recognized my tensioned position.
But he doesn't know, what I know.
What will ruin everything.
That I'm afraid, mom just found out about.
We hear the little bell at the entrance ring and watch our parents enter the diner.
They walk toward us and finally sit down in front of us.
"Fifteen minutes late." Jug says coldly.
"Yeah, we're sorry.." FP says quietly.
"Lets get straight to the point," I say. "You obviously didn't invite us just to drink a milkshake and eat some burgers and fries. You have something on your mind."
Mom looks at FP for a second. "You're right, but let us order first."
She asks for two coffees, one for her and one for her beloved boyfriend.

I sigh. "Do you want to tell us still today or should we come back tomorrow?l" I ask annoyed.
"Fine, Elizabeth" Mom says. "FP, will you?"
She shortly looks at FP and they both nod.
"Kids," FP inhales. "Alice and I decided to get married."
I gasp. "What?!" I say."B-But you're like six months together."
"Yes, but we love each other and want to spend the rest of our life's with each other." Mom explains.
Jug is silent.
"Boy, we will move in with the Coopers." FP says and mom nods smiling.
Don't get me wrong, I'm happy for my mom and FP, they deserve this happiness, but Jug and I...
"D-Does that mean, Betty and I will be... s-stepsiblings?" Jug finally asks.
"Yes," Mom says happily. "I'm sure that will work, you guys already are close friends, aren't you?"
I look at Jug and our eyes meet.
"Yeah.." I say.
"When will all this happen?" Jug asks unsurely. I glare at our parents.
"Starting next week." FP explains. "The wedding will be in two, we already planned some stuff.."
My eyes wander downward and I see mom and FP holding hands, just like me and Jug, but we do it under the table.
I suddenly stand up and walk fast away, towards the bathroom.
I push the door open and throw myself on the toilet and throw up. This is disgusting. I sit up after I finished and quickly clean my hands and my mouth.
As I step our of the bathroom, I see my new family sitting there, staring at me, concerned and confused.
I shyly sit down next to Jug and he takes my hand under the table again.
"What happened, honey?" Mom asks.
"I-I just.. I think I'm sick.." I stutter.
"Oh, then I better get you home right away." Mom says.
She takes my hand and pulls me out of the booth.

JUGHEAD
What the hell was that?
Why did Betty suddenly throw up?
What if it's my fault...
Is she..?