Fuminori Teshima 
An Archdemon’s (Friend’s) Dilemma: How to Babysit a Crybaby Knight Volume 2 [EPUB ebook] 

After successfully thwarting the attempt on Chastille’s life, Barbatos forces the workaholic to take a day off and kicks her out of the office. Chastille, however, has no idea what to do when she’s not working.

Meanwhile, Barbatos discovers that Earthshaker Vepar has been pulling the strings behind the assassination attempts, and Vepar just so happens to have a tempting proposition for him.