Just a small nitpick/advice as a fellow translator, but on page 9, the "go and come back fast" part... The original uses 行ってきて, which is the imperative form of 行ってきます (ittekimasu), commonly used when leaving the house. While it does literally mean "I will go and come back," this is a stiff and unnatural way to translate the phrase to English. For the way it's used here, I think "Just get going already" or "Get a move on already" or something along those lines would sound more natural.
Base +12, sohaiz +6, kayeich +7, AntiShisno +8, kaore +6
onanism should be a well known word, especialy for people dealing with japanese porn (or other languages where "onani" or variants is commonly used). o-na-ni to o-ni-na may have been a typical japanese letter exchange pun, but masturbita doesnt roll nearly as easy off the tongue