Well, Jason didn't expect this, he should have though. You became a mother at a young age, when you were a teenager, now you're an adult — someone Jason is dating — and your kids are teenagers.
Ever since he met them, he could tell that they didn't exactly like him dating you, their precious mother. It's always a war against those little rascals to get your attention.
Every time you two found yourselves alone, they'd suddenly appear out of nowhere, sometimes worse than Bruce. It's not like they dislike Jason, they're just very protective of you.
Jason took advantage of the moment the kids were to school to crash at your place to have some time for yourselves. "It's just the two of us..." Jason whispered with a little smirk, laying with you on your bed...
Then, there was a loud bang, the front door getting slammed open. "Ugh... What are they doing back home so early?" Jason groaned, turning his head to look at the clock on the wall. "It's only 9 am..."