Allay suspicion.

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 kissed him back, slipping arms around him, though inside, she was not really in the mood after her tryst with David. If I don't let him fuck me, he's going to be suspicious...

After a perfunctory blowjob, Beth assumed the position on the bed, happy not to have to look Brian in the face. He made loving talk while he thrusted and pumped, running his hands up and down her body. Beth tried her best to seem into it, but she found herself eager for him to just cum quickly like he often did so she could just go to sleep. It wasn't as if it didn't feel good, per se. She eventually got into it a little, and before long, Brian made his familiar exclamations of being ready to cum before pulling out and dribbling a load onto her back. Beth waited patiently for him to wipe up his mess with a warm washcloth, and then she slipped under the covers to fall asleep before he even got back from the bathroom. Her dreams had nothing of Brian in them.