Scott is theoretically here to bring his mom dinner, since she's on the late shift, but it's also an excuse to visit Erica. She hates to be cooped up in her room alone, so he usually spends a couple of hours with her. By the time a couple becomes a few, she starts getting irritable, and he ducks out politely. It's never exactly nice to spend time with Erica, but it's familiar.
His mom will be expecting him soon. He'll just head across the street to get her some Chinese, and with any luck, he'll be home in time to catch up on some reading.