Gist: Gudao telling Jean that despite all that, he'd rather have a single lover for eternity, since he's just a simple person (hints at her though).
Yorimitsu takes that as a sign of a 'pure' relationship and calms down, telling them that she'll condone their relationship so long as it's 'healthy'. Triggering tsundere JAlter in the process.

Mama's ME EX can be blessed sometimes XD