Didn't they already do this in the anime? lol.

Base +4

Your mistaken, this happened in "chapter 16.5" of the light novel.
However its pretty much implied this probably happened behind the scenes of the story,
but for the sake of decency it wasn't animated... Unless they decided to add it in the
DVD rips

Base +16, Nights002 +6, Xakep +16, Padappa +10

I've heard they are going to add the extra: "the day before" in the first blu-ray disc, however I suppose, it's going to be only about "the wedding" but I hope includes the honey moon too (?)

anyways,I want this to be translated :D

Base +7, Nights002 +6

For the sake of decency it was not even added to the published novel. The chances of it being animated is zero. If you read the text you can see that the author has most probably written the ch.16 in its entirety and then cut the 3/4 of the chapter from the middle and pasted into what is known as 16.5

Base +6