I'm Amy and this story takes place in April of 2020. Christine and I were 18-year-old high school seniors who had just been sent home for the remainder of our spring semester due to the pandemic. Both my brother, William, and Christine's brother, David, had been sent home at the end of March when their colleges shut down-- ostensibly until September.
My father was a truck driver and my mother worked in a restaurant that also closed down because of the pandemic. But, like dad, she had a commercial driver license. So, she went to work at his company delivering the massive upsurge in online orders. They both tended to leave our house early and come home late.
Christine had stayed over for the night. Just after we said bye to mom and dad, she undressed and stepped into the hall bathroom to take a shower. I took this opportunity to go have a quick chat with my big brother. I was wearing one of his old tee-shirts from high school-- one that I enjoyed sleeping in. It was long enough to be a short dress for me.
I lifted the hem quickly to my waist as I turned and sat on the end of his bed. I hate panties and wasn't wearing any, although given the speed with which I sat down I might have been wearing a tiny thong. Nevertheless, I was certain to give Billy a fleeting glimpse at my bare bum-- something that I have been told is rather shapely.
He neither turned away nor commented on it.
"Hey bro, I need to talk to you."
"What's up?"
"I was talking to Christine. She'd like to fuck you."
I have been told that I am rather direct.
"What?" Billy said, clearly surprised.
"Lis-ten clo-se-ly," I said pronouncing every few letters separately," Chr-is-tine, my fri-end, wo-uld li-ke to ha-ve sex with you, my bro-th-er."
"Yeah, I heard you..."
"So?"
"Really?"
"Absolutely," I said, "but you have to do something else first?"
"Like?"
"Fuck me."
"Oh... Fuck... You... Hah, sis, you had me going there for a second."
"You know bro, I'm serious here."
"Uh-huh."
"See," I said, "here's the thing. Christine fucks David."
"David... Her brother David?"
"That's right, and we figured that while we were all here marooned together it would be fun for all of us to play together... You know like in... As a fun-loving group..."
"So, you want to screw David?"
"Well, only after I screw you, bro. I mean you really should come first."
"I should... Come first?"
"Sure you should come first. You are my brother after all."
"Yeah, well, Mickey and I--"
"Last I checked, Mickey wasn't here."
"No, she went home to her parents when the U closed down."
"I know, and who knows when they'll be open again."
"They're saying fall term."
"And that might be true," I said, "but can you take it to the bank? What if it's longer? And even if it's not, are you just going to go without for four or five months?"
"I don't know. Mickey and I have something."
"So, you love her?"
"Yeah, I guess I do."
"And, bro, you love me?"
"Of course I do, you're my sister."
"So, you wouldn't be cheating on Mickey if you had sex with me," I said. "Because you already love me."
"How... How exactly do you figure that?"
"The way I see it, the problem with cheating isn't the having sex part. People don't have any problem having sex or trusting people who had sex with someone else before them. It's the betrayal of emotions part that's the killer. Not being loyal to somebody you made some sort of a promise to... Correct?"
"Yeah, well... I guess so."
"But," I said, "you've already made a promise to love me and take care of me. Before you met Mickey, and she knows that you did. So, you aren't betraying her."
"Well... An implicit promise, yes."
