fall into someone's lap

fall into (one's) lap

To be received unexpectedly or without effort. I didn't steal the internship from you—it fell into my lap, I swear! Your aunt has decided to get a new car, so her old one might fall into your lap.
See also: fall, lap

fall (or drop) into someone's lap

(of something pleasant or desirable) come someone's way without any effort having been made.
See also: fall, lap