It starts with a closet, but that's beside the point. The important thing is the closet gives them the space (however tightly confined) to say it all and then they take it and run.
Izuku is not going to let this chance pass him by. And Katsuki just needs a single hint of an okay, to take it all the rest the way.
Mommy Lisa is excited to further grow her beautiful, homebound girl, especially her tits - that is you, or anyone else you want in that position. The Puppy to Cow pipeline has never seemed so natural...
Heavy kink fic, mind the tags!