The manga's genre has been made pretty clear at this point... So it's a bit too late to complain about this kind of scene.
In fact, why even bother complaining? You know what you were getting yourselves into when you decided to read it.
I'm not complaining about fanservice, but about the target and method for it. If Mitsuki had felt up literally any of the control room crew, or at the very least someone from the regular cast they have a close relationship I'd most likely be gleefully joking about it. Sexually explicit fanservice is part and parcel of erotica, and I know what I'm getting into with that. However, having a heroic character molest a random minor character for a bit of throwaway fanservice feels in poor taste, and as far as I recall, so far, this series has always had pretty good taste. Which is why I was kinda grossed out and bummed by it since I generally expect at least a little better from this series.
The name comes from arabic numbers, like Wahid=1, Isnani=2, and I think thalatha should be salasa/tsalatsa=3, though there might be some dialect/writing system that uses thalatha. Not sure why that one was Tin/tien, as that's not a number but a fruit, Fig to be exact