So me and my friend just started having sex once a week or so for the last few weeks. He had never bottomed before we started. The problem is, i guess my dick is to big. He cant take very much of my dick.

So when we are fuckin, its kinda frustrating for me that i cant put any more than the first 4-5 inches in and it kinda throws off my arousal.

Another small detail is that i like to be very dominant when we have sex. For lack of better word, it “ruins” some of the dominance. I just wanna treat him like a lil hole and fuck him reallly deep

Basically what im asking is, how can we get him able to take more length? Any positions? Practice, exercises?