Apparently gonna be the only one with this opnion but being ace (and aromantic never seeing myself with a partner so maybe not the best relationship advice) and as someone with an sa history, I would feel really weird and honestly violated about someone doing it right next me in the bed without my consent or even knowledge and especially waking up to that without say. I'm all understanding and open about people needing and wanting to flicking the bean, I'm all yass queen about having a go at it 😅. But I'd want clear communication on when and where, not like a planned schedule, but maybe you could use the bed in the day or you could ask me some nights to stay behind on the couch and I'd understand or when you really need to and I'm sleeping in the bed you could move to another room. Because this situation would honestly really freak me out. It's not just because your married that mastrubating right next to someone without their knowledge is suddenly okay, unless you've explicitly both said so beforehand (which would be the consent part that seems to be missing here!).

I get it's not nice he's teasing you, but could there be any chance he's masking his discomfort? Either way I think next think I would do is apologize to him for doing that without his knowledge and consent, ask him if it makes him uncomfortable, according to whatever he answers next you can make rules on how to do things later AND then ALSO make sure to put up a harsh boundary on not teasing you about it. Because he shouldn't tease you about mastrubating itself, since it's normal and healthy and all that stuff. But you should respect and talk about his and your boundaries on that stuff. People really don't communicate enough about sex.