when Scott finds out his beta is dating his sister.
...
"Hey you were amazing out there." I smiled and hugged my boyfriend Liam.
Normally I would kiss him but my brother couldn't know I was seeing his beta.
"I love you." Liam smiled.
He scanned the area for Scott and when he seemed to be gone Liam cashed his lips on mine. We stood there for a while before he go changed. Liam was getting changed when Scott cleared his throat. Liam froze and look at Scott and Stiles.
"Hey guys." He tried.
"Stay away from my sister." Scott said.
"What do you mean?" Liam asked.
"I saw you kissing on the field. She's unavailable Liam get over your little crush." Stiles said.
"No. I love her I promised her I would never ever leave her behind. I know she's your sister I know but I love her so much." Liam said.
"I don't think you get the point." Scott started.
"Are you giving him another lesson?" I asked.
"Liam is off limits you know that." Scott said.
"I love him you can't tell me how to live my life." I said.
"I'm not. I'm telling you how not to live your life." He responded.
"Are you done?" I asked Liam.
"Just my shoes." Liam smiled.
I blushed and took his hand in mine.
"Let's go." I smiled and pulled him along.
"Look at the bright side. She had worse choices in men." Stiles smiled.
"True but I still worry about her safety." He sighed.
"She's your sister no extra danger there." Stiles sighed.
"Am I overreacting?" Scott asked.
"A little bit." Stiles admitted.