I’ve got a 2lb 1 year old deaf boy who is sweet and plays very  gently with me. But I just brought home a second. She is half his size and also very sweet. They seem to like each other. They explore each others space with no problems, eat next to each other and she will invite him to play. The problem isn’t that after a few minutes they play get some rough and her Dooks turn into squeals, she will try to run away, but he doesn’t get the hint because he can’t hear her. I stop play when she is backing into corner a and twice she has pooped. But 10 min sleep later they are fine wandering around together and exploring again. 
How do I help her out and teach him when’s enough isn’t enough? I’d liketo house them together at some point, they snuggle up together outside the cage. But I’m afraid to leave the them together unattended until he can read her cues. 
Any ideas? He so much bigger than her, I don’t know if she could tell him off if she wanted to.