Swagg::Net::Guestbook

I (26F) have been married to my husband (28M) for around 3 years now. I have always known and been fine with him masturbating and am aware that he uses blankets to catch his load. He has a gaming room that he has a specific blanket he uses but also would use another smaller blanket or his own for our bedroom before work or on weekends. We use separate blankets as we have different preferences and it works really well. He has a fleece blanket that he uses and i have a down comforter. A few months back I noticed crunchy spots as I would readjust my blanket at night and decided I would bring it up while he was in a good mood. I casually said I knew he was using my blanket and asked him to stop. He did for a few weeks but it started back up over time. Currently I take my blanket out of the room with me as I tried moving it onto my side of the bed on the floor but he would go get to to complete his mission. I wake up with our little one a couple hours before he does every weekend (a whole other issue) so he uses that time with my blanket if he gets the opportunity. The problem is I am very non-confrontational and even bringing it up the first time took some building up to. I cry at the first start of any high emotion (both sad and happy) even with coping mechanisms I have learned along the way and I feel weak because of it. If he has already not listened with me asking nicely how would you recommend asking again? How can I even reprimand that if he doesn't listen? Anyone have any recommendations for building confidence in uncomfortable conversations?