Suguru came to pick you up from work, because Satoru called you saying he had to 'run an errand' for his family out of town, as usual.

"He gone again?" Suguru asked. A hand on the wheel, while the other one's gripping your thigh. "Don't worry, girl. I gotcha."

He knew your fiancé left you unattended frequently. Satoru was the one who asked Suguru to look out for you whenever he was gone, because he trusted him—his mistake.