One way is through sharing stories. The domme bbw might have many interesting life stories to tell, about her travels or her career. The lawnboy can share his dreams and aspirations with her. By listening to each other, they form a connection that is based on understanding and support.
They could interact positively through cultural exchange. If the bbw is from a different cultural background, she could share her traditions with the lawnboy. He could then introduce her to the latest trends among the younger generation. This way, they both learn from each other and build a bond.