If there was one thing that any parent was more or less always prepared with regarding things related to their child, regardless of gender or species, it was the infamous Shotgun-speech for the child's… partner in life. Which essentially boiled down to "hurt my child and you'll regret it/you're dead", no matter which parent or the gender of the child or the partner. Fortunately for the Demi-Goddess known as Luna Lovegood, she managed to avoid getting said Shotgun-speech from Blake Ouroburos' mom, Ophis, by simply mentioning and showing the Dragon God the Mate-mark on her shoulder, who recognized what kind of mark it was.
"While I am happy for my daughter that she found her mate, I can't help but feel a bit… envious that she found her mate before me." Stated Ophis to Luna as the Dragon God sent her daughter a glance, who was enjoying a nap with her head on her mate's lap. "Anyway, what's the story about the little one? My granddaughter apparently."
"You mean Karna? Blake rescued her during a bounty hunt and brought her with her back to Hogwarts. We took care of her and somewhere along the way she started seeing us as her mom and mommy respectively." Replied Luna while sending the Reincarnation in question a fond glance, who was enjoying some pieces of Wizarding Candy, specifically a box of Bertie Bott's Every Flavor Beans. And judging from the Reincarnation's reactions, so far she hasn't gotten any of the bad ones yet.
"That's interesting. Which is which?"
"She calls me mommy and Blake mom."
"Eww! Gross!" Karna's sudden exclamation earned the Reincarnation the attention of her mommy and grandma, and caused Blake to wake up from her nap, sit up and whip her head in Karna's direction. Apparently her luck seemed to have finally run out and she had gotten one of the bad beans.
"I take it that you got a bad one Karna?" Asked Luna curiously.
"Yes! Rotten tomatoes! Disgusting!"
"I did warn you that the every in Every Flavor Beans was literal."
"May I have one?"
"Sure thing grandma, and good luck!"
"Why don't we all take one, then tell each other what we got?" Suggested Luna, earning various forms of agreement from the other occupants of the compartment. As the four took a bean each, and all four of them seemed to get a good one. "What did you get? I'm pretty sure I got vanilla ice cream."
"Chicken." Blake.
"Cotton candy." Ophis.
"Saffron-sponge cake." Karna.