Everyone really needs to chill out. There is nothing wrong with disliking how Sherry's introduction to group was handled and you are all acting like Kirumba insulted your mother or something. Lean back, take a breath, and stop taking this seriously.
This is just light hentai, not some grand epic like LotR or something
@Kirumba
This is very much a slow burn manga. Based on the speed they've been going at my guess is the third slave wont be introduced for another 20-30 chapters or more (the light novel was this way as well) since this series does an actually decent job of building up and establishing the girls he gets (and a few other chatacters) instead of making them one dimensional.
If that isnt your taste and you like the light hearted daily life feel where the protagonist gets a girl and sticks to just her I could find a few recommendations if you like (Isekai is one of my favorite genres, so I read a lot of it)