As Miss Beelzebub Likes Vol. 11 (manga)

Sargatanas and Astaroth have always viewed their relationship as purely professional, even if they've hoped otherwise. Playboy Astaroth skips out of work to flirt with girls, and Sargatanas keeps the office running while (violently) reeling him back in. But have their true feelings finally become too much to ignore? The fluffy demonic hijinks of Pandemonium are taking a turn for the dramatic...!