A common problem with chastity in a relationship is that the person in chastity is topping from the bottom. He becomes pushy and just thinks about what he wants, forgetting that his partner also should have some fun.
In a relationship open and honest communication is needed. Also with chastity.
This is an example of how you should not try to get your partner interested in holding your key.
Original photo by Daniele Devoti. Text by me. Licensed under Creative Commons Attribution 2.0 Generic.