Boyfriend asks me during sex to play with his butthole and sometimes finger it… normal? Anyone else been asked?

My boyfriend sometimes during sex asks me to play with his butthole, as he gets hornier and things get more hot and heavy between us he has asked me to go harder, where I'm pretty much, and I actually have fingered his butthole (upon his request lmao) and he goes bonanzas- in a positive way, where it's like the best thing that he has ever had done to him- I'm just wondering if anybody else's boyfriends ask for this and if it's somewhat normal for him to be wanting something like that done to him by me? Lol