Here's my shitty translated summary of this:
*"Naughty girls need to be punished. You wanted to do something lewd, didn't you?" In love with him ever since they were young, Aoi married her childhood friend who was like an older brother to her. However, until she reaches 20, there will be no kissing or sex! Tempted to do it in every possible means, Aoi's anxiety increases as things don't seem to progress at all.
One day, she sneaks into a room that only Ren could enter and saw...? His doting, to the point scary, won't stop! The curtains rise to a heart-fluttering and heart-pounding obsessive love!*
The FL is so straightforward about everything and I love it. She's the one who sets the
communication flowing in this without any supporting character needing to play marriage counselor.
And I love how you can see character development from when she was younger to the present. Not that she was bad before but her atmosphere changed as she matured, and that detail is gold.
While the ML has issues he needs to work on because
he had a shitty childhood that probably caused him abandonment issues, and a tendency to make his partner focus only on the good stuff to make them stay. He's lucky to have a patient wife, I would have thrown his ass out the moment he uses foreplay or sex to make me turn the other way. I hope he sets things right. Props to him for setting the "I'm not touching you till you're 20", and sarcastically, for breaking that rule.
Problems aside, they're absolutely adorable and they match. There's the one who's too secretive, and there's the one who's too honest (though much controlled now she's older).
P.S
I hope he killed those assholes. I'm not so sure what happened to the FL at that room, but fuck me, I hope they slip down neverending stairs.