Irony.

When they got upstairs, Beth went straight to the bathroom. She had done so as soon as she arrived home, but she wanted to make sure there wasn't any evidence, not even a smell, of what had happened at the office. When she was confident, she returned to the bedroom to find Brian waiting in his boxers, giving her a look.
"Sorry I had to do that event tonight." He strolled over and took her face in his hands, kissing her deeply. "Thanks for being patient..." He kissed her again. "I missed you."
Beth was filled with a sense of irony. Tonight, of all nights, after I've done a bad thing, tonight he decides he wants to get all lovey and sexy?
She didn't want to raise suspicions, so she found herself lying in bed, sweatpants around her ankles while Brian ate her pussy. She was glad he wasn't watching her face, because she was having trouble hiding her expression. Beth wasn't sure if it was just that she had been so recently satisfied, or that Brian's skills just didn't compare with what she'd just experienced, but she wasn't really getting into it. After a few minutes, she gently made him stop so she could flip over and let him pound her from behind. It was mostly so she wouldn't have to face him, and she faked an orgasm before he pulled out to cum on her back, like he usually did.
After he cleaned her off, they kissed good night, but Beth spent a fair few minutes staring at the clock, not sure whether to be disappointed in herself, Brian or not at all.
"Are you okay, baby?"
"Of course. Thank you for the good sex..." she kissed his cheek. He fell asleep soon after, clearly pleased with the state of their love life. She laid awake for a while, worried about what she had done and how unfulfilled she still felt even with the guilt and shame. Sleep was difficult to achieve.