Pidonus would definitely be the sort to manipulate Tsubomi towards an end, most likely trying to isolate her from her party and convince her to come to the dark side. (Literal, probably uncursed cookies may be involved.) Terribly unsuccessfully other than maybe a short-lived conflict or two.

Tsubomi's idealism could easily wear down at Pidonus should the demoness be captured, possibly setting up for Pidonus being purified, as well.