Hey. Pay attention. This is important. Listen very carefully.
Your mission, should you chose to accept it, is of vital importance.
You're going to find one of those trans girls; you know the type. Insecure, overly-agreeable, quick to offer her time and energy to the cause of making other people happy. You'll find her topping other trans girls, or DMing a campaign, or doing her best to make other people like her feel desirable and wanted. Yes, I see the light dawning in your eyes - you know exactly who I mean.
Once you find her, you'll need to act quick. You need to push her down, get her while she's high, or simply overpower her if possible, but you need to get a collar around her neck ASAP. She'll struggle, deny that she needs it, ask you what you want instead. You have options here; you can tell her that you want her, or you can tell her to shut up and make it clear through your actions.
Regardless, once you've tightened the collar around her neck, she should go limp and get all pliable. This is where the fun begins, and is absolutely critical that you have fun. Her pleasure (and pain!) should be the first priority, but if you're not enjoying yourself, she WILL know. Still, this is your chance to play around with a tgirl. Take full advantage of it! Feel up her tits, stick your fingers in her mouth - enjoy her dumb little sensitive moans. I'd recommend employing some light hypnosis to make things easier next time; implant some commands to make her melt whenever you'd like!
DO NOT MAKE HER TOP. DO NOT TOUCH HER DICK UNLESS YOU ARE 1,000% POSITIVE YOU ARE TREATING HER LIKE A GIRL. IF YOU DON'T UNDERSTAND WHAT I MEAN THEN DON'T TOUCH HER DICK.
When she's getting tired, or has cum, or has started to tap out, then its time to move onto the second to last step - don't let it end. Don't take her collar off. Put her in the chastity cage that she bought and barely used. This is her new normal now, and she's going to have to accept it. Tell her that! Tell her that she belongs to you; that her cock might as well not be there anymore. Tell her that her body exists for your pleasure. She's your toy. A cute, submissive little pet for you to use and abuse at your leisure.
Here's the real final step - make good on your promise. Feel her up. Don't make it a one time thing. Don't let it be a once in a blue moon occasion. You've stripped her bare, forced her to give in and submit for her own sake and for yours, instead of sacrificing her own engagement for other people's pleasure. Don't waste that vulnerability.