Does 1.3 have much in story? I mean the 1.1 to 1.2 wasn't much.
Not really, but no such thing is advertised.
What is advertised, however, is one quest with 2 images for Mrs. L, one sidequest including the lovely nurse who we all love to blackmail(while secretly feeling guilty about it) and a new character - the secret loving/conspiracy theorist/school paper journalist Maxine! Also, you can toggle the X-Ray between clothed, underwear and fully nude now, a much appreciated addition to the game.
All in all, a fun little update. The devs also state that new releases are going to be much more frequent, with each release containing a few new quests(and spicy content, of course). (Im)patiently waiting for the next one!
P.S.: Also, the 1.1 to 1.2 jump added the X-Ray mode(NOT an easy thing to implement - lots of art being separated into layers/split into parts and code needing to be reworked and added) and a great deal of polish, bugfixes and QoL features, effectively laying the foundations for the rest of the game. No story was added, but now that those things are out of the way, new content should be easier to create.