Imagine years down the road, Marinette and Adrien get married and keep facing off against Hawk Moth. They know each others' secret identities, but the rest of Paris doesn't. Gabriel has his suspicions that his son and daughter-in-law are also his nemeses, but he's never arrived at definitive proof either way.
Now imagine that Marinette and Adrien announce at a family dinner that Marinette is pregnant.
Zoom in on Gabriel's face as he is visually going "Oh crap! Oh crap! Oh crap!" He arrives at the conclusion, "I guess I'll have to cut back on the evilizing, because I don't want to risk my grandbaby."
Chloe Bourgeois (a.k.a Queen Bee!) was ecstatic to hear Ladybug's announcement. Not only did babies make adorable accessories, but this meant Chloe got to keep her miraculous full-time. All the others did as well. And as tedious as it would be to have to work with Rena Rouge All. The. Time., it was worth it. The plan was simple. Ladybug would arrive late to every battle, usually just in time to purify the akuma. Hopefully that would be enough to keep her -and her soon to be adorable baby bump- safe.
Anyway, today they had worked out that the (garishly dressed, unkempt) supervillain they were fighting was a physician in her civilian life. She called herself Bed Rest and was flying around city dispensing aggressively accurate medical recommendations. A shouting match at the park became forced meditation - "Outbursts like this exacerbate hypertension," shouted the akumatized woman. A violently coughing girl ran screaming from a giant pill bottle chasing her. Chloe snickered as they passed an obese man tied to a treadmill. All in all, not a bad way to start the day. Until she heard Chat Noir's scream.
"No," he shouted, throwing himself between the villain and a massive pill hurtling toward Ladybug, who had just arrived on the scene. It hit him, dissolving as he he fell to the ground and - nothing. He was purrfectly (ugh, his puns were invasive) perfectly fine. Meanwhile Carapace and Rena Rouge restrained the villain and were about to release the akuma (it was in her prescription pad) when Chat Noir said, "Wait! I need to talk to Hawkmoth."
Chat grabbed the akuma by the shoulders and practically growled, "I know you can hear me, Hawkmoth. I also know you're human under that suit, so I'm going to tell you this in the hopes that there are lines even you won't cross. Ladybug is pregnant. That means she is off-limits. In case you don't actually have any human decency, let me put it this way. If so much as one hair on her head comes to harm because of you during her pregnancy, I will not rest until I find you and we discover what happens when I use Cataclysm on a person."
Hawkmoth's voice spoke through the akuma victim, "I promise not to harm her. You'll notice you weren't hurt at all by the projectile meant for Ladybug."
The victim added. "It was a prenatal vitamin. It has a higher dose of iron than most people need, but with just the one pill, you'll probably be fine, Chat Noir."
Meanwhile, in an creepy lair somewhere in the city, Hawkmoth laughed evil-ly, "Foiled again. But they have not seen the last of me. One way or another, Marinette, I'll have the healthiest grandbaby in the city."