My adopted brother is 17 and I’m 15. He is so gorgeous, with his blue eyes and brown floppy hair. He sometimes comes out the shower with just a towel around his waist and the way the water runs down his body turns me on. This one time, he came out with a hard on and looked at me creepily, and I just backed away. He asked me to follow him to his room, so I did and he sat down, took his towel off and guided my hand to his c***. He made me stroke it and I can’t lie, it felt amazing to feel it and watch him moan. Now we sometimes kiss when no ones home, touch each other in our rooms. I can’t help but feel guilty, but at the same time I don’t feel I should because we aren’t blood related. I guess it’s because I consider him as a real brother. But at the same time, it was an exciting experience because the thought of it being so wrong was thrilling. Should I feel bad?