Kind of the other way around it seems.
Yasu's god wants Sensei to fuck Yasu, and knock her up. That is basically the point of Yasu's religion, or as Imani has put it:
Yasu kind of exists to get knocked up by Sensei:
That's probably her main use for her god. Of course, it wanted this when Sensei had it's light, but currently, Sensei's light has burnt out:
At the moment, Yasu's god probably doesn't care what happens to her. It seems to be mostly sleeping and waiting for Summer.
Frankly, it seems like all of the main gods/supernatural things want Sensei to fuck the girls whether he wants to or not (under certain conditions at least). Hence all the rapey stuff.
Presumably, this let's
them more or less fuck the girls using his body (since they gave him it), and as Pareidolia put it, it lets them "sing" through the girls:
Nao also notes that every thing that Sensei has felt, has been felt by it and others:
Overall: When Sensei gets laid, so does the gods it seems. More or less.
Sensei is basically just a glorified strap on for the gods, so that they can fuck and feel. So, he's kind of sharing with them, whether he's aware of it or not.