...I don't know, it's probably the usual personality that fanon gives to Sakuya and Remi, but it feels like sparks are about to fly between them in the 4th panel. And their smiles just add up.
Just a hunchAwwwAwwwwDid It Get Through?Whoa!Yoo-hoo, I came over to play!Mistress! From now on, let us greet your guests, okay!Booo!Reimuuu...GrinWell, I kinda got the feeling you were calling me, Remilia!Yup! That's what I'll dooo!Smile.... You didn't go back home?Shff