I found my brother wearing my clothes and his girlfriend told him to. How should I deal with this?

[Iltopo]

I came home for the Easter holidays a couple of days ago to my mum and my little brother who's 16. I found him home alone in my room when I came home early from meeting friends, wearing the uniform for my waitressing job. A black blouse and mini-skirt with black tights. I would have confronted him right there but he then began to work on his hair, which he has been growing really long and then used my makeup. From the work he did, he'd definitely done it before and to give him some credit, he really passed for a girl. After that he tried on some of my shoes and locked himself in his room.

I listened outside his room and heard him make a Skype call to his girlfriend who is on holiday in Spain. When she connected, I heard her start gushing over how my brother looked, calling him pretty. My brother kept asking if he had got his makeup and hair right and if she thought that he looked hot. They talked for while and from what I could gather, she was the one who started this and leading him along in it as she asked him to wear a dress next time they Skyped and he agreed. After hearing enough, I left the house and came back later to find him acting like it had never happened.

I don't want to tell my mum as I've literally just told her that I'm dating a girl and she was disappointed and I don't think finding out her youngest son is crossdressing would make the situation better.

My main problem is with his girlfriend who seems to be orchestrating the whole thing. If it was just him trying on my clothes and makeup, I'd sit down and talk with him and give him support but I don't want to encourage a girl's fantasy in using my brother like this in case it gets worse. He's too young for anything like this.

I really don't know what to do, I only want to help my brother and don't want to alienate him but what he's doing with his girlfriend seems wrong and manipulative. Aside from my girlfriend, I have literally no one else to turn to so any genuine advice would be amazing.

[Anonymous]

well if you ''confront'' him about it of course he is going to deny it. you should just let him know that you won't tell your mom but on that condition he has to let you in on it. Let him know you aren't angry and listen to his reasoning behind it. If the girl is manipulating him then tell him why its wrong. If its his choice accept it