My Adopted Brother and I: Update

So yesterday I made a post about my adopted brother and I. There were a few questions in the comments and some concerns that I want to clear up. So the first thing is someone accused me of being a troll which is not at all true. Second someone wanted to know our ages and if it was legal I am 20 he is 25 and where we live it is not against the law being that we are not biologically related. Thirdly someone wantec to kniw how it started. To be clear there was no build up over years to this I was not molested or sexually harassed/assaulted by him. Anyways this first started in November around Thanksgiving time, I had come home pretty late crying because my boyfriend had broken up with mxe earlier in the day and I went for drinks to clear my mind. I go into my room and all my emotions hit me and I start crying. I guess I was a little loud and my brother comes into my room asking if I im ok, so I tell him what happened. He stays with me and and tries to comfort me. He tells me that I deserve better. Without thinking I kiss him. He pulls back first and I apologize, he tells me its okay and I just needed to a connection with someone. This time he kisses me and one thing lead to another. We didn't talk about it for a while until it happened 2 more times. I dont know feel bad about it or regret it. Based on the poll a majority of ppl said no or it depends but most of the comments were pretty negative. I understand this is probably morally wrong and Ive talked to him about it and we've agreed we probably should not be doing this and we should stop. Thxs for the help.