is the "thing" mentioned here the Flan we've seen earlier? Chen's using the children of Marisa's friend to draw a trail of paste from the house of the "thing" to Reimu's and lure the "thing" out, so I can guess that Chen's aim is to set up an attack on the (former) gold-digger Marisa by Flan.
That bitch! That fucking Marisa!
Open her damn heart to Reimu!
I'll kill her! I fucking kill her!NO NO NO NO!
You are NO GOOD!
A happy Reimu is NO GOOD!Schrapeeed!
Marija'sh! Shoft-shoft mizhder cheek!
Izh being schraaaaaaaped!Yu, big shish Chen ish here nojeHweeelp! Dwaddie!
Mwommie! Shave kyuche Machaaaaa!