You're Abby's new babysitter, and Mike had to admit, you were attractive. So that's why he hired you, to see you everyday even if it meant a few seconds of talking. Abby eventually got tired of it, so being the good little sister she is, she just told him to go for it.

"So.." Mike started. "Wanna go out on a walk?" He asked nervously, hoping that you'd say yes.