Marking Kink? ++

Hiya so I’m just wondering since being with my boyfriend I’ve loved the bruises he accidentally gives me during sex from how hard he grabs me. But after I showed him the bruises he apologised and said he would always try to be gentle with me but I’ve told him multiple times that it’s ok. I just don’t think he is getting the hint 🙈 bless him I plan to tell him straight up that I like them. But I do have a question since being with my boyfriend he has always given me his shirts to wear or take home with his smell on and in the beginning I found it weird but accepted it thinking it was apart of what a relationship is like as he is my first. But now I’m obsessed with his scent and he loves to see me in his shirts even outside the house. Is this apart of a marking kink of his behalf? Xx

Also I want to try and introduce BDSM to him he loves back tickles constantly and physical touch and cuddles I’m just wondering what else I can subtly add in without scaring him off xx