You would communicate with each other outside of bedroom. This also means that you would communicate things other than where you are going to stay tonight and other topics like this. If he genuinely wants to hear about your day, your life and what is going on with your career, he might be more interested in you than just hooking up. Usually, hookup partners are only related sexually. They won’t care any other things going on in your life besides from getting laid. Therefore, if you found that your hookup partner cares about you more than usual hookup partners do, then you should think if your relationship is turning to more serious one.
Your hookup partner remembers things. When someone really cares about you, they would remember things related to you. Such as what kind of coffee you like, what time you usually go to bed in the evening and wake up in the morning, what kind of food you like to eat and other detailed things like these. This is nature. When someone likes you, they would unconsciously care about your well-being as well as your little habit. If you find your hookup partner remembers some of your habit, he might like you for real.
He appreciates your personality, not just body and appearance. Your appearance might be the first reason he hooks up with you, as many people do when they meet someone on the best dating app. They are attracted by their appearance and then start hooking up. However, with time passing by, you spend lots of time with each other and you get to know each other better. You found out that their personalities can be much more attractive than the appearance. That is how a relationship starts. Hence, one day, you noticed your trans hookup partner is praising your personality, that shows he really appreciates you from your personality. That is real appreciation.
You come first in bed. When you are in bed, he honors your satisfactory over his own. He would please you in every way trying his best. He would care how you feel, if you are comfortable. He would even think up new ways to try with you, just for your satisfactory.
He would make sacrifice just to be with you. If one person really cares about you, he would want to spend more time with you. With that being said, sometimes, he might choose to spend a night with you over a night with his friends.
You would see each other outside of the bedroom for non-sexual related purposes. Have you ever been invited by him to go out on a date with him? It may not sound so obvious. Sometimes, he is trying to do it in a subtle way without your noticing. For example, you may be asked to grad a dinner or a coffee before you going to bed together. You may be invited to watch a movie with him in the sofa before you get each other naked.