Wow, he actually carried her all the way to the door just to lock it...
I mean, considering it's Hentai, I'm sure nothing bad will come even if the little sister sees what they're doing, but...Well, quick thinking, I can respect that.
Great ending, too.
You just have to love those cute schoolgirls with their high level sex drive! Even more if they refer to your dick as "Penis-kun" and not some emasculated names like "the little one"... No man likes his mighty Jormungandr to be called like this....
When we speak of serpents, what should spring to mind but the fell Jormungandr? But in truth, I have my own glorious serpent I bring out at parties and on special occasions. In fact--
[-Prince Olivert of the Erebonian Empire, late 1204]
Remember, friends, any partner can become a dom if you don't 'relax' with them often enough, and all tension must eventually release before things snap!
Gonna have to start using that.