Come on to

He was really coming on to me at the party.

Sometimes I go to bed alone, horny and frustrated, angry at myself for not being more assertive and coming on to a new man who excited me.

It came on to snow after dusk.

She wakened in sharp panic, bewildered by the grotesquerie of some half-remembered dream in contrast with the harshness of inclement fact, drowsily realizing that since she had fallen asleep it had come on to rain smartly out of a shrouded sky.