It's seem like in the panel above the Flan crying one, she was saying "I" "also" "Meirin". Guess she was saying she also want to do that/be close/something like that with Meiling. And guess Meiling said you too young 'cause Flan like "I'm 495 yrs old" XD
Updated
Jeez!Sakuya...Ojou-sama...
"My lady" or "Mistress"Those two are always, always...!Wa ha!FLANJust forget it.F-FL-BONUS!Come to think of it...Does he love me?*tearing up*Huh? Imouto-sama?
Lit. "little sister," a respectful title for the mansion's "young mistress"...Hey, why are you crying?!It's your fault!WAAAA~~~~~HHH!What's with that laugh!?Be-cause......Are you sure?-sama~!...you're so adorable.So cute! ♥WHA-!?Oh, cra-!*BLUUUSH*Flan-sama.UNFAIR!FAILURE
I'm sorry~!*sigh*