Mullin jokes that he might put in a transfer request and Beelzebub takes it pretty hard. Mullin gets worried that he might have upset her, so he goes to Astaroth for advice. Meanwhile, Belphegor can't help but run away when she sees Azazel. Belphegor wishes she could tell Azazel how she feels, but just can't work up the courage, and that's when she runs into him in the library...
and they ended up staying up 
late several nights in a row.
وانتهى المطاف بسهرهما حتى وقت متأخر
لعدّة ليالي على التوالي
und so blieben sie
mehrere Nächte hintereinander wach.
y se quedaron hasta tarde varias noches.
y se quedaron hasta tarde varias noches.
qui nécessitaient
qu’ils restent tard le soir.
e sono dovuti rimanere 
in piedi fino a tardi per svariati giorni.
eles acabaram trabalhando
durante várias noites seguidas.
и им пришлось задерживаться
на ночь несколько раз.