Done is done.

About thirty seconds later, Beth was lying on top of Kyle, resting her head on his chest just under his chin. She was running her fingers along the tattoos on his ribcage and enjoying the sound of his heartbeat.
"Are you okay?" she whispered.
"Yeah...it's just..." his voice was subdued.
"I know..." she snuggled deeper. She knew how wrong what they had just done was. She couldn't deny the guilt. On the other hand... it had been amazing. She hadn't had sex that good in a long time... And never with Brian. It wouldn't help anything for her to be dishonest with herself about that. And there was the retributive aspect for Kyle. Nothing justified it, though. She had cheated on Brian with his own brother. {if Formation = 5}

I tried so hard not be this girl anymore... Tiger can't change her stripes, I guess.{elseif Formation = 1}
I can't believe it. Me! A cheater! Little Miss Prude! How did this happen?!
{elseif Formation = 3}
And he's not even an older guy! Crazy.
{elseif Formation =4}
And he's not even a bad boy, who would have guessed I would cheat with a sweetie like him... ?
{else
}I just...Damn it why couldn't things with me and Brian just have stayed good? I didn't want to do this... I never wanted to be a cheater. The fact that she was somehow getting mad at Brian over her own infidelity told her how twisted up her brain was at that moment. {endif
}
"Well..." Kyle shifted, and Beth shifted as well, so that they were looking at each other. "Can't go back and..."
"Un-fuck me?" she couldn't help a little levity.
"This is serious, Beth." But he did smirk at her joke. "I guess done is done... we can't..."
"Yeah." We can't do this again. "You're right."
"You should get back to bed before you get us in trouble."
"In a minute or two...I just want to...enjoy this for a little bit longer."
She could feel his chest tremble as he took a deep shuddering breath. "Yeah, me too." For a big, tough soldier, Kyle was turning out to be a big softie.

She crept back upstairs after a few more minutes of closeness. Bypassing her bedroom, she slipped into the bathroom to sit on the toilet and clean her snatch. Jesus... there's a enough baby gravy in me to impregnate like four girls. She pulled out sticky fingers, and marveled at the viscous white fluid, giving it a taste. Kyle definitely favored meats and fatty food over fruit...but she found she kind of liked the pungent, saltier semen. Brian's cum was sweeter and much more watery most of the time.
After sufficiently cleaning and deodorizing, she slipped back into bed next to her snoring fiancee. In the morning, things will just go back to normal, and we'll never speak of this to anyone. She hoped that was the case.... but her multiple sex dreams about Kyle that night didn't fill her with confidence....