The mc got into an accident when he was young and now he has a hard time feeling sensations. Sex for him is becoming less stimulating and he starts wanting to have pain. Because of his yearning for pleasure and sensations in general he sleeps around a lot. After he has gotten bored with his sex partner of 2 months he thinks his partner came back and and tops him (his partner was the bottom) he likes it so much and thought that maybe he should stay with him but after turning around he sees it’s not his partner. He finds out the guy is the shut in younger brother (ml is 23) of his partner. He finds out that the ml is younger than himself and so at first thinks he shouldn’t be with him and tell the younger brother to tell his partner that they are done. (He at first doesn’t want to be with him because he can’t stand younger men which is something you find out the reasoning for in the first couple chapters.) eventually he can’t help himself and tries to get close and have sex with the ml. (Mac also finds it hard to deal with that mc is a hopeless romantic who believes you should have sex with only someone you’ll marry. I know it sounds like a lot of spoiling but this is basically the reason everything happens and is the starting point.

i am so so utterly confused by that summary but could someone help explain in a clearer and straightforward way without spoiling the story?
it could be because im reading this at 2am but yeah id still appreciate a summary