Oh my, I've been thrust from a moderately unreasonable setting to a moderately reasonable one. The transition is such a stark contrast that my head is spinning and I am thoroughly creeped out.
Maybe you should have pushed the horror aspect a little longer or harder or better before coming to this scene. It's not really charged with paranoia or unease. Orgy, ok, weird. Catacombs, ok, dark. Suburban house, not weird or dark, and since the quest is early on the woman can only be some kind of monster.
You're supposed to use these plot elements to give the readers a rest from the relentless stress of the horror and frustration. It changes things and lets everybody cool off before the next set of terrors sets in. The way you've presented it is just silly.