Brother asks sister to take naked picture of him in the pool. You can't see who it is or anything because he face down but you can definitely say that he's naked. Brother says they'll do the other side (front) the next day. Later he shares this info with someone on the phone who finds it very weird and rather disturbing and he replies that they've always done it and that he has a picture back from when they were 18 and that all of them (he and his other siblings) have taken nudes of each other /together as adults and they all find it perfectly normal to be naked around each other sometimes.