Many thanks to jellybelly2 for first editing and improving this story and to slipperywhenwet_ for edits and insights that made it better.
*
He could see she was hot, but when she walked up to him, Zeke had no idea that she was steaming.
"Hi Zeke," she said in a pleasant melodic voice. "My name is Nina. You know my friend, Tina."
"Tina," he said, sounding disappointed. She wasn't coming on to him but talking about someone else. "Yes, she's a great gal."
"You're right about that. She's my sister in Pi Kappa Upsilon. We all love her."
"Yeah. I like her, too."
"Did you know she's at this party?" asked Nina. "She's right over there. Do you see her?"
"Yeah, that's her. There are so many people here on Saturday after the game that sometimes I can't even find my friends."
"What a great game," Nina said. "You were amazing. All those tackles! I think they should have given you the game ball instead of the quarterback."
"Thank you, Nina," Zeke said. He was trying to decide whether he should make a move on her or not. As hot as she was, he decided not to since she was a friend of Tina's. He scanned the room and thought of how he could get away from her.
"Do you think of her as a friend?" Nina asked.
"Who? Oh, you mean Tina. Sure. She's a good friend."
"Can you see her walking over there? Don't you think she walks funny?"
"I never noticed that she walked funny."
"She doesn't walk funny all the time," Nina said. "She's walking like that because somebody hurt her."
He looked at Nina. Her face told him she was accusing him.
"It wasn't me. I would never hurt a woman. That's not the way I was brought up. Did Tina say I hurt her?"
"All she does is defend you. But she doesn't date anyone else, so it was easy for the sisters to find out why she walks that way. It's because you're so big, if you know what I mean."
Zeke resisted the impulse to puff out his chest.
"I'm a big man, and sometimes the ladies tell me they get a little sore. Forgive me if I'm offending you, but you brought it up. I promise you that I always use lots of lube with Tina, and she's never complained. Maybe you've never been sore after a really exciting night, so you don't know what I mean."
"You don't have to explain. I've hooked up with some big men and been rubbed the wrong way, but that's not Tina's problem. She's a tiny little thing, but I think she can accommodate you -- except when you put it in the wrong place."
"What do you mean?"
"If it's as big as you say, you can't expect to put it back there when you're with a little lady without causing damage."
"I'm very careful," Zeke protested. "And I don't pressure her. She's never said anything about me hurting her."
"I believe you," said Nina, "because I think she feels differently about you than you feel about her."
"I like her a lot.".
"That's what I mean. You like her a lot, and she feels differently. You know what I mean."
"A lot of girls have a thing for football players," he said. "I don't know why."
"I don't either," said Nina. "Nothing against you, Zeke. You're right. A lot of girls like the football heroes, and many of them get hurt by jocks. But those girls aren't sisters in Pi Kappa Upsilon."
"What are you trying to say?"
Zeke was getting tired of the conversation.
"I'm saying we'd appreciate it if you stick to Tina's pussy from now on."
"Did you talk to her about that?"
"No, we didn't, Zeke. We're asking you politely because we care about her, and she doesn't deserve the pain."
"I'll tell you, Nina. I like Tina. I do things for her, and she does things for me. I promise you, I will never force her to do anything she doesn't want to do. But she's a grown woman. She can make her own decisions. Whatever she tells me, I'll respect her."
"What if she told you, she didn't want you in her butt anymore? What would you tell her then?"
"What do you mean?"
"I mean, would you drop her fast?"
"I don't drop anyone fast. I was raised to respect women. You can ask any of my old girlfriends. I never disrespected them when we broke up."
"Let me put it another way," Nina said. "Would you be willing to say to Tina, 'Hey, Tina, if it hurts you, please tell me. I promise you it won't mean anything to our relationship.'"
Zeke didn't answer her question.
"I'm not interested in you and your sorority sisters sticking your noses into what Tina and I choose to do in privacy. I think I've made myself clear. If she chooses to listen to you, that's up to her."
"I think you've made yourself perfectly clear, Zeke," said Nina. "If she stops giving you her ass, you'll respectfully drop her as fast as you can. You obviously have no feelings for her, and you're lying when you say you respect her."
"You're calling me a liar? No man would dare say that to the biggest linebacker in our conference because they know I'd wail on them. You're a woman, so you get a pass. But I don't have to talk to you anymore, and I'm not going to."
"I understand, Zeke," she said, grabbing his shirt as he took a step away from her. "Just one second. I've tried to get my message across, but you don't seem to have the brains to understand it. I'll make it so simple that a chimpanzee can get it. If you don't stop hurting Tina, you're going to get hurt yourself.
"When we were pledges and went through initiation, we stuck a pin in our fingers and signed an oath in blood. We swore that we would never let a sister down and that we would do anything to protect each other. Next time Tina has a date with you, we're going to be watching. After you bring her home, she better not be walking like she is tonight."
************
Zeke knew that girls in top sororities like Pi Kappa Upsilon never did anal, not even for football stars. There were plenty of tramps from some of the slut sororities who were willing.
That's why Tina was so special. She was so small and beautiful that he couldn't believe she didn't turn him down and tell him off like all the Grade A girls.
When they did it, he could tell it was her first time, and it was hard on her, so he was surprised when she didn't stop his next attempt. She became one of his regulars. He didn't always put it in her ass, but whenever he felt like plugging some booty, she was the one he called.
He didn't worry much about Nina's threat, but he knew even a girl could hurt him with a gun. So he surprised Tina the next time they went out.
They were in bed, and she asked him, 'Do you want to do that thing you like now? I've got to leave in half an hour."
"No. I don't feel like it tonight."
"You don't?" she said happily.
She didn't ask him after that, and he didn't ask her for a couple of months. But then one night, he was feeling down. The team had lost a close one two days before, and he was moping around. Without thinking, he called her up. When he started going for her ass, she was a little upset.
"I thought you weren't interested in that anymore?"
"I'd really like it tonight, Tina. But if you don't want to, I understand. You're so little, and I'm so big."
"You know I never say no to you to anything you want. You date lots of girls. Have any of them ever told you that?"
"No," Zeke said. "You're the only one, and I respect you for that. Now bring that pretty round thing over here."
The next day, he got a text from Nina: