Responses
also since it’s been very long im not sure if they’re blood related siblings since i remember the relationship between mother and the father was off
I think it's "An innocent sin"
http://www.mangago.me/read-manga/an_innocent_sin/
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Im looking for a manga where the guy was forced to go home by his sister because she’s threatening him on hurting the guy and when they when home he was always sexually abused by her and there was one time where the mother put something on the perfume vase in the bathroom while he was showering so when he was showering he was breathing the scent and it made him loss control of his own body.