We all new it was coming, theres been an air of romance, mirroring the comic books, between the Vision and the Scarlet Witch for a while in the MCU.
This link from Comicbook.com tells of a scene from Infinity War where they share a kiss.
Aw bless.....
http://comicbook.com/marvel/2017/04/19/avengers-infinity-war-scarlet-witch-vision-romance/