This happened years ago
Well I have a twin brother and we shared a room. We were 15 and well it happened. Sure I liked it but it only happened once.
My brother and I both thought we liked guys but, were not sure. We had gone to bed and suddenly in the middle of the night my brother whispered to me I'm horny as hell.
I answered back me too. He asked me if I wanted to jerk off each other. I said yea. He came over to my bed and dropped his drawers. His erection sprang out. I told him his cock was bigger than mine.
I took out my cock and it was also super hard. We jerked each other for about an hour and, that was it we didn't do it again but, we knew. I decided I liked women and well he chose guys.