First letter

After fucking for an hour more, Jack came inside Elma two more times, he was slightly exhausted after so much work.

Not only has he faced a strange wooden puppet just now, but he has also had sex with Cassie before coming to Elma and now he has sex with Elma five more times.

Any ordinary person would be exhausted to death by now, however, Jack still has energy in his body.

It was all thanks to his physical fitness and he has an inkling feeling that his Ero meter had also contributed to his physical stamina.

Or else Jack couldn't explain his stamina.

Before getting Ero Meter, Jack was a virgin and he didn't know what his stamina was and now he wasn't sure if Ero Meter had affected his sexual stamina or not.

As he has no proof that Ero Meter has affected his stamina, neither he knew that his own sexual stamina was so great because he never had sex with anyone without Ero Meter, so he was in between both of them.