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A quick synopsis of what you missed. His housemate Julie came in and after a serious head wound on his part she is slowly convinced to let him do things. That ends up being a huge quantity of oral sex and he almost gets enough to get better.

He also explains how mana gain works for him, which comes down to pleasure. The more intense, the better. If you're touching that's great and you get less with distance exactly the same as magnetism and gravity and such work. (Cutting the distance in half is just as effective if it's an inch or 20 metres.) If it's pleasure you're not causing yourself you get much less, and you get a multiplier if it's something either of you finds kinky or pervy. (**** counts exactly as much as it being your fetish.)

Everything else will be explained as the story goes on.