Sorry to Have Kept You Waiting

is episode 47 of Beelzebub anime.

Summary
The anime opens seeing the 2 pillars who got beaten in jail, and 2 other pillars talking to them. One is Lamia's mom.

They then cut to the main gang who are tired from playing video games. Shiro acts as Lamia while talking to En. He speaks like a ditzy schoolgirl, but En buys it.

One of the lines he says is "Let's To-Love-Ru Darkness". This is a reference to the ongoing 2nd manga series of To Love-Ru that began in 2010.

Next episode preview
Oga apologizes for letting everyone wait and promises to beat everyone up. Baby Beel makes an evil laugh. Kunieda asks Oga what his special attack is, to which Oga notes that she's gotten stronger, but that this fight is for him and Baby Beel only. He tells her not to interfere. After Oga announces the next episode, he tells Baby Beel that it's time for milk, but Kunieda warns him that it's too dangerous.