PONYBOY:

You still think it's funny. He doesn't. You were on the bleachers waiting for Ponyboy to finish track practice. He finished and collected all of his things. You were about to leave, when you couldn't get your backpack zipped. You grunted and pulled it shut with every ounce of strength you had. As your elbow swung back, it swung right into Ponyboy's crotch. He yelped and doubled over clutching his balls. You felt terrible and asked if he was ok. "Yeah, I'm fine." He grunted through pain.

When you told his brothers, they laughed.

SODAPOP:

It was boring just sitting around waiting for your boyfriend to finish his shift. When he got a break, you asked him if he wanted to hang out. He sat on the counter with you as you read magazines in silence with occasional talking.
"I'm thirsty you want anything?" You asked him. "Yeah, get me a Pepsi." He told you. You nodded and walked over to the Pepsi's. he stood up and you tossed it at him.  You did. It shattered on the floor but not before hitting his "No good" area. "Oww!" He cried out with tears in his eyes. "Oh my God! I'm so sorry babe!" He collected himself, by taking steady breaths. "Yeah, but maybe next time just hand it to me."
You giggled and agreed.

Steve helped you clean up while laughing hysterically after you told him the story.

DALLAS:

The only reason he didn't kill you was because you were his sister. You were old enough to hang around Buck's so you waited in your room. Dallas came in and he was drunk. Because of this when you accidentally kneed him in the balls when he picked you up, he started to cry. You didn't know what to do so you just grabbed his beer bottle and put it on his dick. He felt better after that. He claims he didn't remember it, but you and Buck do.

TWO-BIT:

You were at the drive-in standing by your car waiting for your boyfriend Two-Bit to get there.
You waited for 15 minutes before he snuck up behind you. You got scared and kicked in the balls. You heard a grown and someone hit the ground. You looked down and saw Two-Bit laying on the ground clutching his injury.
"Two-Bit don't scare me like that!" You smacked him as you helped him up. "Lesson learned." He told you still in pain.

DARRY:

You accidentally hit him with the ladder you were helping him carrying. 

STEVE:

He was under the car, and he needed a wrench. He slid out from under the car the same time you came running in. You tripped and you head hit his balls. Uh oh. He immediately threw you off of him and ran into th len

Johnny:

"Johnny watch!" You had learned a back tuck and you wanted to show him. You jumped back and as you were landing, your foot connected with his balls. He fell to his knees, wide eyed, holding his breath. "Oh my god Johnnycake are you okay?" "Oh, yeah baby. Just hurt."
"I'm sorry!" You felt so bad.

You walked to Buck's and Dallas got you an ice pack and then you showed him again, this time from a distance.