It’s quite a difficult topic to give advice on, but I will try as best I can. A common thing for you to do in this situation would be to “guide” your partner, in a physical sense. pulling their hand up to your neck, placing their hand in your hair, actions like that coupled with you indicating how much pressure and effort to put into the actions are a surefire way for you to get the reaction that you want, and over time will hopefully show him that you are not as weak as he thinks. However, if you want him to “play roughly” with you in the D/s sense, you have to be careful with this as it can often be seen as “topping from the bottom” and warrant repercussions.
Apart from this, find him examples of what you want on the internet and show him these and tell him bluntly this is what you want. This cab be an effective way of showing to your partner what you want, and also give them something to go off when they are attempting to replicate it during your sex. This is about the most advice I am able to give on the topic, but I hope that it helps.
Have Fun
Sincerely Sir