Reveal all the awkwardness. Except from awkwardness, is there anything else? Regardless someone farted in bed or you find your partner is hooking up with someone else, given that this is okay based on the rules you set for each other, just smile and get over with it. There is no reason who feel guilty or angry about if it you agreed with each other that it is going to be just hookup. If you think it is still awkward, you can make a joke about it or talk about it directly. Just find a comfortable zone where you can be relaxed.
If they want to try something that you are not comfortable about, let them know. Maybe their sexual fantasies do not match with yours. That is totally possible. Actually, you can hardly find someone who have the same sexual fantasies as yours. As a matter of fact, it is very possible that they may want to try something you cannot stand, like a threesome, or BDSM. If you are 100% sure that you will not be okay with it, do let them know. Don’t force yourself into doing anything you don’t like and won’t enjoy. Casual hookup is all about fun. If there is no fun, let it go. In return, don’t expect your partner to meet every desire you have. They are human-being, not your sexual toy.
Decide how often you want to hookup with adult friends on dating apps. Do you want to spend every weekend with each other? Every day? If you are each other’s fixed hookup partner, you should discuss it, so that someone won’t feel abandoned when he/she is refused sometime.
Respect the privacy of each other. When you make love with each other, you can be very intimate and you will discover some privacy about each other as well. Even if you are exclusive hookup partner to each other, that does not make you his/her girlfriend/boyfriend. On the one hand, give each other space and time to be alone. On the other hand, keep your whole hookup thing to yourself if one of you is not comfortable with revealing it.
Don’t make a big deal. You might be hooking up with someone and it may seem a big deal to you. As a matter of fact, everyone is doing it. The number of people hooking up is much larger than you think. Hookup culture is much more common than that you expect. Don’t waste your time fixating on something happen between you. Don’t over-comprehend every move your partner takes. Remember, you are hooking up, not in a relationship.