I (21f) recently went through my brothers (18m) phone. I never thought of him in any way other than my brother until I came across his dick pic. I know it's his because his nails were still purple from when I painted them. Since then memories from when we were kids and would play innocent games like spin the bottle and kiss each other's cheeks or when we'd shower together and I'd help him come up all the time. I've even masturbated to the thought of it. It has even made me look at my own husband's dick differently. I know my husband would be okay with me doing stuff with my brother but have no idea how he'd feel. It's just crazy how one picture can change your entire outlook on a person. I hadn't even realized my little brother grew up but now all I can think of doing is nasty things with him.