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Sounds like Usagi no Mori by Enjo. That description helped jog my memory, sorry if it isn't the one you're looking for-
Omg this is it!! Tysmmmm <3
(≧∀≦) Happy to help!
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The ml likes the mc but the mc can’t reciprocate because he has these rules for himself. The mc grew up with his mom who does stuff with men for money and he grew up from childhood watching that. So he made rules of what not to do for himself, one of those being a no sex rule. But he does want to do stuff with the ml so the ml says that the mc can pretend that he’s forcing him because that’s the only way the mc will allow himself to do those things. One day the ml goes to his house and finds the book.
I don’t remember much but the mc gets scared one day that his mother will want him next so he runs to the ml’s place. I know that they were students and that the mc slept over at the ml house a couple times.
Sorry for the long description!! I tried asking chatgbt but it couldn’t find it ╥﹏╥